Heraclitus

[ her-uh-klahy-tuh s ]
/ ˌhɛr əˈklaɪ təs /

noun

the Obscure,c540–c470 b.c., Greek philosopher.

British Dictionary definitions for heraclitus

Heraclitus
/ (ˌhɛrəˈklaɪtəs) /

noun

?535–?475 bc, Greek philosopher, who held that fire is the primordial substance of the universe and that all things are in perpetual flux