Demetrius the Fair (Dêmêtrios ho Kalos; the Greek word means "beautiful", not "blond") was a Macedonian prince. He was an illegitimate son of Demetrius Poliorcetes, sometime king of Macedon, and was half-brother of Antigonus Gonatas, king of Macedon. Apama, widow of king Magas of Cyrenaica, brought Demetrius the Fair over to become ruler of Cyrenaica by being married to her daughter Berenice II, who earlier, during Magas's lifetime, had been betrothed to a son of Ptolemy II of Egypt. When Demetrius the Fair arrived, Apama herself made him her lover. Young Berenice did not stand for this: she led an uprising in which Demetrius was killed in Apama's bedroom. The date of the dramatic event is variously estimated by modern authors as about 255 or 250 BC; the earlier date seems likelier, since Berenice at the time was "little more than a child". This Berenice, one of several to bear the name, was the one who later became Queen Berenice II of Egypt, wife of Ptolemy III, and whose hair became the constellation Coma Berenices. The flattering poem Coma Berenices by Callimachus (lost, but known in a Latin translation or paraphrase by Catullus), apparently refers to her killing of Demetrius: "Let me remind you how stout-hearted you were even as a young girl: have you forgotten the brave deed by which you gained a royal marriage?"