Gelo (or Gelon, d. 478 BC, Greek: Γέλων; gen: Γέλωνος), son of Deinomenes, was a 5th century BC ruler of Gela and Syracuse and first of the Deinomenid rulers. Early life Gelo was the son of Deinomenes, a Sicilian tyrant king of Gela who was best known for conquering Catania on the east coast of Sicily. The historian Herodotus writes that his ancestors came from the island of Telos in the Aegean Sea and were the founders of the city o… (More on Gelo)