Titus Livius (Livy), The History of Rome, Book 45
William A. McDevitte, Sen. Class. Mod. Ex. Schol. A.B.T.C.D., Ed.

11. Whilst these events were going on, Antiochus, after a fruitless attempt on the walls of Alexandria, had retired: [p. 2126]and being now master of all the rest of Egypt, he left, at Memphis, the elder Ptolemy, whose restoration to the throne was the pretended object of his armament, though, in reality, he meant to attack him, as soon as he should have vanquished his competitors; and then he led back his army into Syria. [2] Ptolemy, who was not ignorant of his intention, conceived hopes, that, while he held his younger brother under terror, and in dread of a siege, he might be received into Alexandria, provided his sister favoured the design, and his brother's friends did not oppose it. [3] Accordingly, he never ceased sending proposals to his sister first, and his brother and his friends afterwards, until he effected an accommodation with them. [4] His suspicions of Antiochus were awakened by this circumstance, that, when he gave him possession of the rest of Egypt, he left a strong garrison in Pelusium: a plain proof that he kept that key of Egypt in his hands, in order that he might be able, whenever he pleased, to introduce an army again into the country; [5] and he foresaw, that the final issue of a civil war with his brother must be, that the conqueror, thoroughly weakened by the contest, would be utterly unable to contend with Antiochus. [6] In these prudent observations of the elder brother, the younger, and those about him, concurred; while their sister greatly promoted the negotiation, both by her advice and entreaties. Accordingly, peace being made with the approbation of all, the elder Ptolemy was received into Alexandria, without any opposition even from the populace; [7] who, during the war, had been severely distressed by a general scarcity, not only in consequence of the siege, but from receiving no provisions from the rest of Egypt after the enemy had retired from the walls. [8] Although it was reasonable to suppose that Antiochus would be rejoiced at these events, if he had really marched his army into Egypt for the purpose of reinstating Ptolemy on the throne, —(the plausible pretext which he had professed to all the states of Asia and Greece, in his answers to their embassies, and in the letters that he wrote,) —yet he was so highly offended, that he prepared to make war on the two brothers, with much greater acrimony and fury of resentment than he had shown against the one. He instantly sent his fleet to Cyprus; and, as soon as the spring appeared, he directed his route towards Egypt at the head of his army, and advanced into Cœle- [p. 2127]syria. [9] Near Rhinocolura he was met by ambassadors from Ptolemy, who gave him thanks, because through his assistance he had recovered the throne of his fathers; and requested him to secure to him the enjoyment of the benefit, which he had himself conferred; and rather to signify what he wished to be done, than from an ally to become an enemy, and proceed by force of arms. [10] To this he answered, that “he would neither recall his fleet, nor stop the march of his army, on any other conditions than the cession of all Cyprus and the city of Pelusium, together with the lands adjoining the Pelusian mouth of the Nile;” [11] and he even named a particular day, on or before which he expected to receive an answer that these demands were complied with.