(Γιζέικος), king of the Vandals, and the most terrible of any of the barbarian invaders of the empire. He was the bastard son of Godigisdus (Procop. Bell. Vand. 1.3) or Modigisdus (Hist. Miscell. 14), king of the Vandal settlers in Spain, and left, in conjunction with his brother Gontharis or Gonderic. in possession of the throne. His life divides itself into two parts : 1st, the conquest of Africa (A. D. 429-439); 2nd, the naval attacks on the empire itself (A. D. 439-477).
[A.P.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890