by Polybius
I say then the Pontus has long been in process of being filled up with mud, and that this process is actually going on now: and further, that in process of time both it and the Propontis, assuming the same local conditions to be maintained, and the causes of the alluvial deposit to continue active, will be entirely filled up. For time being infinite, and the depressions most undoubtedly finite, it is plain that, even though the amount of deposit be small, they must in course of time be filled. For a finite process, whether of accretion or decrease, must, if we presuppose infinite time, be eventually completed, however infinitesimal its progressive stages may be. In the present instance the amount of soil deposited being not small, but exceedingly large, it is plain that the result I mentioned will not be remote but rapid. And, in fact, it is evident that it is already taking place. The Maeotic lake is already so much choked up, that the greater part of it is only from seven to five fathoms deep, and accordingly cannot any longer be passed by large ships without a pilot. And having moreover been originally a sea precisely on a level with the Pontus, it is now a freshwater lake: the sea-water has been expelled by the silting up of the bottom, and the discharge of the rivers has entirely overpowered it. The same will happen to the Pontus, and indeed is taking place at this moment; and though it is not evident to ordinary observers, owing to the vastness of its basin, yet a moderately attentive study will discover even now what is going on.
41. For the Danube discharging itself into the Pontus by several mouths, we find opposite it a bank formed by the mud discharged from these mouths extending for nearly a thousand stades, at a distance of a day’s sail from the shore as it now exists; upon which ships sailing to the Pontus run, while apparently still in deep water, and find themselves unexpectedly stranded on the sandbanks which the sailors call the Breasts. That this deposit is not close to the shore, but projected to some distance, must be accounted for thus: exactly as far as the currents of the rivers retain their force from the strength of the descending stream, and overpower that of the sea, it must of course follow that to that distance the earth, and whatever else is carried down by the rivers, would be projected, and neither settle nor become fixed until it is reached. But when the force of the currents has become quite spent by the depth and bulk of the sea, it is but natural that the soil held in solution should settle down and assume a fixed position. This is the explanation of the fact, that, in the case of large and rapid rivers, such embankments are at considerable distances, and the sea close in shore deep; while in the case of smaller and more sluggish streams, these sandbanks are at their mouths. The strongest proof of this is furnished by the case of heavy rains; for when they occur, rivers of inferior size, overpowering the waves at their mouths, project the alluvial deposit out to sea, to a distance exactly in proportion to the force of the streams thus discharging themselves. It would be mere foolish scepticism to disbelieve in the enormous size of this sandbank, and in the mass of stones, timber, and earth carried down by the rivers; when we often see with our own eyes an insignificant stream suddenly swell into a torrent, and force its way over lofty rocks, sweeping along with it every kind of timber, soil, and stones, and making such huge moraines, that at times the appearance of a locality becomes in a brief period difficult to recognise.
42. This should prevent any surprise that rivers of such magnitude and rapidity, flowing perpetually instead of intermittently, should produce these effects and end by filling up the Pontus. For it is not a mere probability, but a logical certainty, that this must happen. And a proof of what is going to take place is this, that in the same proportion as the Maeotic lake is less salt than the Pontus, the Pontus is less so than the Mediterranean. From which it is manifest that, when the time which it has taken for the Maeotic lake to fill up shall have been extended in proportion to the excess of the Pontic over the Maeotic basin, then the Pontus will also become like a marsh and lake, and filled with fresh water like the Maeotic lake: nay, we must suppose that the process will be somewhat more rapid, insomuch as the rivers falling into it are more numerous and more rapid. I have said thus much in answer to the incredulity of those who cannot believe that the Pontus is actually being silted up, and will some day be filled; and that so vast a sea will ever become a lake or marsh. But I have another and higher object also in thus speaking: which is to prevent our ignorance from forcing us to give a childish credence to every traveller’s tale and marvel related by voyagers; and that, by possessing certain indications of the truth, we may be enabled by them to test the truth or falsehood of anything alleged by this or that person.
43. I must now return to the discussion of the excellence of the site of Byzantium. The length of the channel connecting the Pontus and Propontis being, as I have said, a hundred and twenty stades, and Hieron marking its termination towards the Pontus, and the Strait of Byzantium that towards the Propontis, — half-way between these, on the European side, stands Hermaeum, on a headland jutting out into the channel, about five stades from the Asiatic coast, just at the narrowest point of the whole channel; where Darius is said to have made his bridge of ships across the strait, when he crossed to invade Scythia. In the rest of the channel the running of the current from the Pontus is much the same, owing to the similarity of the coast formation on either side of it; but when it reaches Hermaeum on the European side, which I said was the narrowest point, the stream flowing from the Pontus, and being thus confined, strikes the European coast with great violence, and then, as though by a rebound from a blow, dashes against the opposite Asiatic coast, and thence again sweeps back and strikes the European shore near some headlands called the Hearths: thence it runs rapidly once more to the spot on the Asiatic side called the Cow, the place on which the myth declares Io to have first stood after swimming the channel. Finally the current runs from the Cow right up to Byzantium, and dividing into two streams on either side of the city, the lesser part of it forms the gulf called the Horn, while the greater part swerves once more across. But it has no longer sufficient way on it to reach the opposite shore on which Calchedon stands: for after its several counter-blows the current, finding at this point a wider channel, slackens; and no longer makes short rebounds at right angles from one shore to the other, but more and more at an obtuse angle, and accordingly, falling short of Calchedon, runs down the middle of the channel.
44. What then makes Byzantium a most excellent site, and Calchedon the reverse, is just this: and although at first sight both positions seem equally convenient, the practical fact is that it is difficult to sail up to the latter, even if you wish to do so; while the current carries you to the former, whether you will or no, as I have just now shown. And a proof of my assertion is this: those who want to cross from Calchedon to Byzantium cannot sail straight across the channel, but coast up to the Cow and Chrysopolis, — which the Athenians formerly seized, by the advice of Alcibiades, when they for the first time levied customs on ships sailing into the Pontus, — and then drift down the current, which carries them as a matter of course to Byzantium. And the same is the case with a voyage on either side of Byzantium. For if a man is running before a south wind from the Hellespont, or to the Hellespont from the Pontus before the Etesian winds, if he keeps to the European shore, he has a direct and easy course to the narrow part of the Hellespont between Abydos and Sestos, and thence also back again to Byzantium: but if he goes from Calchedon along the Asiatic coast, the case is exactly the reverse, from the fact that the coast is broken up by deep bays, and that the territory of Cyzicus projects to a considerable distance. Nor can a man coming from the Hellespont to Calchedon obviate this by keeping to the European coast as far as Byzantium, and then striking across to Calchedon; for the current and other circumstances which I have mentioned make it difficult. Similarly, for one sailing out from Calchedon it is absolutely impossible to make straight for Thrace, owing to the intervening current, and to the fact that both winds are unfavourable to both voyages; for as the south wind blows into the Pontus, and the north wind from it, the one
or the other of these must be encountered in both these voyages. These, then, are the advantages enjoyed by Byzantium in regard to the sea: I must now describe its disadvantages on shore.
45. They consist in the fact that its territory is so completely hemmed in by Thrace from shore to shore, that the Byzantines have a perpetual and dangerous war continually on hand with the Thracians. For they are unable once for all to arm and repel them by a single decisive battle, owing to the number of their people and chiefs. For if they conquer one chief, three others still more formidable invade their territory. Nor again do they gain anything by consenting to pay tribute and make terms; for a concession of any sort to one brings at once five times as many enemies upon them. Therefore, as I say, they are burdened by a perpetual and dangerous war: for what can be more hazardous or more formidable than a war with barbarians living on your borders? Nay, it is not only this perpetual struggle with danger on land, but, apart from the evils that always accompany war, they have to endure a misery like that ascribed by the poets to Tantalus: for being in possession of an extremely fertile district, no sooner have they expended their labour upon it and been rewarded by crops of the finest quality, than the barbarians sweep down, and either destroy them, or collect and carry them off; and then, to say nothing of the loss of their labour and expense, the very excellence of the crops enhances the misery and distress of seeing them destroyed before their eyes. Still, habit making them able to endure the war with the Thracians, they maintained their original connexions with the other Greeks; but when to their other misfortunes was added the attack of the Gauls under Comontorius, they were reduced to a sad state of distress indeed.
46. These Gauls had left their country with Brennus, and having survived the battle at Delphi and made their way to the Hellespont, instead of crossing to Asia, were captivated by the beauty of the district round Byzantium, and settled there. Then, having conquered the Thracians and erected Tyle into a capital, they placed the Byzantines in extreme danger. In their earlier attacks, made under the command of Comontorius their first king, the Byzantines always bought them off by presents amounting to three, or five, or sometimes even ten thousand gold pieces, on condition of their not devastating their territory: and at last were compelled to agree to pay them a yearly tribute of eighty talents, until the time of Cavarus, in whose reign their kingdom came to an end; and their whole tribe, being in their turn conquered by the Thracians, were entirely annihilated. It was in these times, then, that being hard pressed by the payment of these exactions, the Byzantines first sent embassies to the Greek states with a prayer for aid and support in their dangerous situation: but being disregarded by the greater number, they, under pressure of necessity, attempted to levy dues upon ships sailing into the Pontus.
47. Now this exaction by the Byzantines of a duty upon goods brought from the Pontus, being a heavy loss and burden to everybody, was universally regarded as a grievance; and accordingly an appeal from all those engaged in the trade was made to the Rhodians, as acknowledged masters of the sea: and it was from this circumstance that the war originated of which I am about to speak.
For the Rhodians, roused to action by the loss incurred by themselves, as well as that of their neighbours, at first joined their allies in an embassy to Byzantium, and demanded the abolition of the impost. The Byzantines refused compliance, being persuaded that they were in the right by the arguments advanced by their chief magistrates, Hecatorus and Olympidorus, in their interview with the ambassadors. The Rhodian envoys accordingly departed without effecting their object. But upon their return home, war was at once voted against Byzantium on these grounds; and messengers were immediately despatched to Prusias inviting his co-operation in the war: for they knew that Prusias was from various causes incensed with the Byzantines.
48. The Byzantines took steps of a similar nature, by sending to Attalus and Achaeus begging for their assistance. For his part Attalus was ready enough to give it: but his importance was small, because he had been reduced within the limits of his ancestral dominions by Achaeus. But Achaeus who exercised dominion throughout Asia on this side Taurus, and had recently established his regal power, promised assistance; and his attitude roused high hopes in the minds of the Byzantines, and corresponding depression in those of the Rhodians and Prusias. Achaeus was a relation of the Antiochus who had just succeeded to the kingdom of Syria; and he became possessed of the dominion I have mentioned through the following circumstances. After the death of Seleucus, father of the above-named Antiochus, and the succession of his eldest son Seleucus to the throne, Achaeus accompanied the latter in an expedition over Mount Taurus, about two years before the period of which we are speaking. For as soon as Seleucus the younger had succeeded to the kingdom he learnt that Attalus had already reduced all Asia on this side of Taurus under his power; and being accordingly eager to support his own rights, he crossed Taurus with a large army. There he was treacherously assassinated by Apaturius the Gaul, and Nicanor. Achaeus, in right of his relationship, promptly revenged his murder by killing Nicanor and Apaturius; and taking supreme command of the army and administration, conducted it with wisdom and integrity. For the opportunity was a convenient one, and the feeling of the common soldiers was all in favour of his assuming the crown; yet he refused to do so, and preserving the royal title for Antiochus the younger, son of Seleucus, went on energetically with the expedition, and the recovery of the whole of the territory this side Taurus. Meeting however with unexpected success, — for he shut up Attalus within the walls of Pergamus and became master of all the rest of the country, — he was puffed up by his good fortune, and at once swerved from his straightforward course of policy. He assumed the diadem, adopted the title of king, and was at this time the most powerful and formidable of all the kings and princes this side Taurus. This was the man on whose help the Byzantines relied when they undertook the war against the Rhodians and Prusias.
49. As to the provocations given before this to Prusias by the Byzantines they were various. In the first place he complained that, having voted to put up certain statues of him, they had not done so, but had delayed or forgotten it. In the second place he was annoyed with them for taking great pains to compose the hostility, and put an end to the war, between Achaeus and Attalus; because he looked upon a friendship between these two as in many ways detrimental to his own interests. He was provoked also because it appeared that when Attalus was keeping the festival of Athene, the Byzantines had sent a mission to join in the celebration; but had sent no one to him when he was celebrating the Soteria. Nursing therefore a secret resentment for these various offences, he gladly snatched at the pretext offered him by the Rhodians; and arranged with their ambassadors that they were to carry on the war by sea, while he would undertake to inflict no less damage on the enemy by land.
Such were the causes and origin of the war between Rhodes and Byzantium.
50. At first the Byzantines entered upon the war with energy, in full confidence of receiving the assistance of Achaeus; and of being able to cause Prusias as much alarm and danger by fetching Tiboetes from Macedonia as he had done to them. For Prusias, entering upon the war with all the animosity which I have described, had seized the place called Hieron at the entrance of the channel, which the Byzantines not long before had purchased for a considerable sum of money, because of its convenient situation; and because they did not wish to leave in any one else’s hands a point of vantage to be used against merchants sailing into the Pontus, or one which commanded the slave trade, or the fishing. Besides this, Prusias had seized in Asia a district of Mysia, which had been in the possession of Byzantium for many years past.
Meanwhile the Rhodians manned six ships and received four from their allies; and, having elected Xenophantus to command them, they sailed with this squadron of ten ships to the Hellespont. Nine of them dropped anchor near Sestos, and stopped ships sailing into the Pontus; with the tenth the admiral sailed to Byzantium, to test the spirit of the people, and see whether they were al
ready sufficiently alarmed to change their minds about the war. Finding them resolved not to listen he sailed away, and, taking up his other nine ships, returned to Rhodes with the whole squadron.
Meanwhile the Byzantines sent a message to Achaeus asking for aid, and an escort to conduct Tiboetes from Macedonia. For it was believed that Tiboetes had as good a claim to the kingdom of Bithynia as Prusias, who was his nephew.
51. But seeing the confident spirit of the Byzantines, the Rhodians adopted an exceedingly able plan to obtain their object. They perceived that the resolution of the Byzantines in venturing on the war rested mainly on their hopes of the support of Achaeus. Now they knew that the father of Achaeus was detained at Alexandria, and that Achaeus was exceedingly anxious for his father’s safety: they therefore hit upon the idea of sending an embassy to Ptolemy, and asking him to deliver this Andromachus to them. This request, indeed, they had before made, but without laying any great stress upon it: now, however, they were genuinely anxious for it; that, by doing this favour to Achaeus, they might lay him under such an obligation to them, that he would be unable to refuse any request they might make to him. When the ambassadors arrived, Ptolemy at first deliberated as to detaining Andromachus; because there still remained some points of dispute between himself and Antiochus unsettled; and Achaeus, who had recently declared himself king, could exercise a decisive influence in several important particulars. For Andromachus was not only father of Achaeus, but brother also of Laodice, the wife of Seleucus. However, on a review of the whole situation, Ptolemy inclined to the Rhodians; and being anxious to show them every favour, he yielded to their request, and handed over Andromachus to them to conduct to his son. Having accordingly done this, and having conferred some additional marks of honour on Achaeus, they deprived the Byzantines of their most important hope. And this was not the only disappointment which the Byzantines had to encounter; for as Tiboetes was being escorted from Macedonia, he entirely defeated their plans by dying. This misfortune damped the ardour of the Byzantines, while it encouraged Prusias to push on the war. On the Asiatic side he carried it on in person, and with great energy; while on the European side he hired Thracians who prevented the Byzantines from leaving their gates. For their party being thus baulked of their hopes, and surrounded on every side by enemies, the Byzantines began to look about then for some decent pretext for withdrawing from the war.