XXII. The Rhodians defended themselves with great spirit, and Demetrius was unable to accomplish anything against them; but he still continued the siege out of anger, because they had captured a ship in which his wife Phila had sent him letters, clothes and bedding, and had sent it at once to Ptolemy, just as it was. In this they were far from imitating the courtesy of the Athenians, who, when Philip was at war with them, captured a messenger and read all the letters which he carried except one written by Olympias, which they did not open, but sent it on to him with the seal unbroken. However, although Demetrius was much nettled by the conduct of the Rhodians, he did not stoop to retaliation upon them, although he soon had an opportunity of doing so. Protogenes of Kaunus happened at that time to be painting a picture of Ialysus[302] for the Rhodians, and Demetrius found the picture very nearly completed in one of the suburbs of the city. The Rhodians sent a herald and begged him to spare the work, and not destroy it, to which he answered, that he would rather burn his father's statues than such a precious work of art. Apelles tells us that when he saw this picture, the sight at first took away his breath; and that at last he said, "Indeed this is a wonderful piece of work, and must have cost great labour." Yet it has not that grace which gives so divine a charm to the works of Apelles himself. This picture shared the common lot of all Greek works of art, being taken to Rome, where it was destroyed by fire. As the Rhodians gallantly held their own in the war, Demetrius became weary of the siege, and gladly accepted the offer of the Athenians to act as mediators. They made peace between them on condition that the Rhodians should act as the allies of Antigonus and Demetrius, except against Ptolemy.