Moreover, Ptolemy Ceraunus had lived for a long time in Macedon, at the court of Lysimachus, having fled there from Egypt on account of the quarrels in which he was involved in his father's family. He was a man of a very reckless and desperate character, and, while a young man in his father's court, he had shown himself very ill able to brook the preference which his father was disposed to accord to Berenice and to her children over his mother Eurydice and him. In fact, it was said that one reason which led his father to give Berenice's family the precedence over that of Eurydice, and to propose that _her_ son rather than Ptolemy Ceraunus should succeed him, was the violent and uncontrollable spirit which Ceraunus displayed. At any rate, Ceraunus quarreled openly with his father, and went to Macedon to join his sister there. He had subsequently spent some considerable time at the court of Lysimachus, and had taken some active part in public affairs. When Agathocles was poisoned, he fled with Lysandra to Seleucus; and when the preparations were made by Seleucus for war with Lysimachus, he probably regarded himself as in some sense the leader of the expedition. He considered Seleucus as his ally, going with him to aid him in the attempt to recover the kingdom of his ancestors. Seleucus, however, had no such design. He by no means considered himself as engaged in prosecuting an expedition for the benefit of Ceraunus. _His_ plan was the enlargement of his own dominion; and as for Ceraunus, he regarded him only as an adventurer following in his train--a useful auxiliary, perhaps, but by no means entitled to be considered as a principal in the momentous transactions which were taking place. Ceraunus, when he found what the state of the case really was, being wholly unscrupulous in respect to the means that he employed for the attainment of his ends, determined to kill Seleucus on the first opportunity.