"Zeal." Zelus is the personification of zeal or strife, a son of Styx and Pallas. Zelus and his siblings Nike, Bia, and Cratos stood in attendance of Zeus' throne.
- Hesiod. Theogony, 384.
- Hyginus. Fabulae: Preface.
- Pseudo-Apollodorus. The Library i, 2.4.
- Smith, William. (1870). Dictionary of Greek and Roman Biography and Mythology. London: Taylor, Walton, and Maberly.