Phobos was the son of Ares (Mars), and Aphrodite (Venus) in Greek mythology. He was associated with fear, dread, and panic, as his name directly translates. He is often depicted as a man with the head of a lion, holding a spear, commonly called "Phobos' Spear of Panic." He had a twin brother, Deimos. His Roman counterpart is Timor, or Timorus.
The suffix "-phobia", representing an irrational fear of something, derives from Phobos and, ultimately, the Greek word "φόβος", meaning "fear".