(Ζῆλος), the personification of zeal or strife, is described as a son of Pallas and Styx, and a brother of Nice. (Hes. Theog. 384 ; Apollod, 1.2.4.)
[L.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