[3] Love is wont to bring many calamities upon men. Lysimachus, although by this time of mature age and considered happy in respect of his children, and although Agathocles had children by Lysandra, nevertheless married Lysandra's sister Arsinoe. This Arsinoe, fearing for her children, lest on the death of Lysimachus they should fall into the hands of Agathocles, is said for this reason to have plotted against Agathocles. Historians have already related how Arsinoe fell in love with Agathocles, and being unsuccessful they say that she plotted against his life. They say also that Lysimachus discovered later his wife's machinations, but was by this time powerless, having lost all his friends.[4] Since Lysimachus, then, overlooked Arsinoe's murder of Agathocles, Lysandra fled to Seleucus, taking with her her children and her brothers, who were taking refuge with Ptolemy and finally adopted this course. They were accompanied on their flight to Seleucus by Alexander who was the son of Lysimachus by an Odrysian woman. So they going up to Babylon entreated Seleucus to make war on Lysimachus. And at the same time Philetaerus, to whom the property of Lysimachus had been entrusted, aggrieved at the death of Agathocles and suspicious of the treatment he would receive at the hands of Arsinoe, seized Pergamus on the Caicus, and sending a herald offered both the property and himself to Seleucus.
Edition :
Pausanias. Pausaniae Graeciae Descriptio, 3 vols. Leipzig, Teubner. 1903.
Remark :
date: The date is taken from the New Pauly: https://referenceworks.brillonline.com/entries/brill-s-new-pauly/agathocles-e107240?s.num=3&s.f.s2_parent=s.f.book.brill-s-new-pauly&s.q=agathokles#e107290
