zelus

This Zelos is the Greek personification. For other uses, see Zelos. In Greek mythology, Zelus (Greek: Ζήλος, zeal) was the son of Pallas and Styx and brother of Nike, Cratos and Bia, and part of Zeus' retinue. He was the personification of dedication and emulation.Zelus is also an assassin bug in the family Reduviidae. One common species is Zelus biloba.
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[Greek] Zelus ("zeal") is the personification of zeal or emulation. He is the son of Styx and the Titan Pallas, brother of Nike, Cratos and Bia. Zelus is the constant companion of Zeus.

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jealousy; spirit of rivalry/emulation| partisanship; zeal (L+S); fervor