To add to this unexpected good fortune, news arrived that Ptolemy had dismissed his mother and children, bestowing upon them presents and honours; and also that his daughter Stratonice, whom he had married to Seleucus, was remarried to Antiochus, the son of Seleucus, and proclaimed Queen of Upper Asia.
For Antiochus, it appears, had fallen passionately in love with Stratonice, the young queen, who had already made Seleucus the father of a son. He struggled very hard with the beginning of this passion, and at last, resolving with himself that his desires were wholly unlawful, his malady past all cure, and his powers of reason too feeble to act, he determined on death, and thought to bring his life slowly to extinction by neglecting his person and refusing nourishment, under the pretence of being ill. Erasistratus, the physician who attended him, quickly perceived that love was his distemper, but the difficulty was to discover the object. He therefore waited continually in his chamber, and when any of the beauties of the court made their visit to the sick prince, he observed the emotions and alterations in the countenance of Antiochus, and watched for the changes which he knew to be indicative of the inward passions and inclinations of the soul. He took notice that the presence of other women produced no effect upon him; but when Stratonice came, as she often did, alone, or in company with Seleucus, to see him, he observed in him all Sappho's famous symptoms,- his voice faltered, his face flushed up, his eyes glanced stealthily, a sudden sweat broke out on his skin, the beatings of his heart were irregular and violent, and, unable to support the excess of his passion, he would sink into a state of faintness, prostration, and pallor.
Erasistratus, reasoning upon these symptoms, and, upon the probabilities of things, considering that the king's son would hardly, if the object of his passion had been any other, have persisted to death rather than reveal it, felt, however, the difficulty of making a discovery of this nature to Seleucus. But, trusting to the tenderness of Seleucus for the young man, he put on all the assurances he could, and at last, on some opportunity, spoke out and told him the malady was love, a love impossible to gratify or relieve. The king was extremely surprised, and asked, "Why impossible to relieve?" "The fact is," replied Erasistratus, "he is in love with my wife." "How!" said Seleusus, "and will our friend Erasistratus refuse to bestow his wife upon my son and only successor, when there is no other way to save his life?" "You," replied Erasistratus, "who are his father, would not do so, if he were in love with Stratonice." "Ah, my friend,"answered Seleucus, "would to heaven any means, human or divine, could but convert his present passion to that; it would be well for me to part not only with Stratonice, but with my empire, to save Antiochus." This he said with the greatest passion, shedding tears as he spoke; upon which Erasistratus, taking him by the hand, replied, "In that case, you have no need of Erasistratus; for you, who are the husband, the father, and the king, are the proper physician for your own family." Seleucus, accordingly, summoning a general assembly of his people, declared to them, that he had resolved to make Antiochus king, and Stratonice queen, of all the provinces of Upper Asia, uniting them in marriage; telling them, that he thought he had sufficient power over the prince's will that he should find in him no repugnance to obey his commands; and for Stratonice, he hoped all his friends would endeavour to make her sensible, if she should manifest any reluctance to such a marriage, that she ought to esteem those things just and honourable which had been determined upon by the king as necessary to the general good. In this manner, we are told, was brought about the marriage of Antiochus and Stratonice.
To return to the affairs of Demetrius. Having obtained the crown of Macedon, he presently became master of Thessaly also. And holding the greatest part of Peloponnesus, and, on this side of the Isthmus, the cities of Megara and Athens, he now turned his arms against the Boeotians. They at first made overtures for an accommodation; but Cleonymus of Sparta having ventured with some troops to their assistance, and having made his way into Thebes, and Pisis, the Thespian, who was their first man in power and reputation, animating them to make a brave resistance, they broke off the treaty. No sooner, however, had Demetrius begun to approach the walls with his engines, but Cleonymus in affright secretly withdrew; and the Boeotians, finding themselves abandoned, made their submission. Demetrius placed a garrison in charge of their towns, and, having raised a large sum of money from them, he placed Hieronymus, the historian, in the office of governor and military commander over them, and was thought on the whole to have shown great clemency, more particularly to Pisis, to whom he did no hurt, but spoke with him courteously and kindly, and made him chief magistrate of Thespiae. Not long after, Lysimachus was taken prisoner by Dromichaetes, and Demetrius went off instantly in the hopes of possessing himself of Thrace, thus left without a king. Upon this, the Boeotians revolted again, and news also came that Lysimachus had regained his liberty. So Demetrius, turning back quickly and in anger, found on coming up that his son Antigonus had already defeated the Boeotians in battle, and therefore proceeded to lay siege again to Thebes.