(Κύζικος), a son of Aeneus and Aenete, the daughter of Eusorus. (Apollon. 1.948; V. Fl. 3.3.) According to others, he was himself a son of Eusorus, and others again make him a son of Apollo by Stilbe. (Hyg. Fab. 16; Conon, Narrat. 41; Schol. ad Apollon. Rhod. l.c.) He was king of the Doliones at Cyzicus on the Propontis. In compliance with an oracle he received the Argonauts kindly, when they landed in his dominion. When, after their departure, they were cast back upon the shore by a storm and landed again at night-time, they were mistaken by the Doliones for a hostile people, and a struggle ensued, in which Cyzicus was slain by Heracles or Jason. On the next morning the mistake was discovered, and the Argonauts mourned for three days with the Doliones over the death of their king, and celebrated funeral games in his honour. (Apollod. 1.9.18; Conon, Narrat. 41, who gives a different account.)