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Kastor is the secondary antagonist of the Captive Prince trilogy. He is Damen's older half-brother by 8 years, and is the out-of-wedlock son of Theomedes and Hypermenestra, Theomedes' mistress. Theomedes raises him as Crown Prince until Damen is born from Theomedes' wife, Egeria. Because he is a bastard but Damen is born legitimately, when Damen is born, Damen becomes Crown Prince instead.

At the beginning of the series, to become king, Kastor poisons his father and sends Damen to Vere as a slave. 


Kastor is tall, with dark hair, dark eyes, and olive skin. He has a straight nose, high cheekbones, and looks like his father.[1]


  1. Kings Rising, Ch. 19