Ronac, also spelled Ro'nak and Ro'nac, was the First Prime of Cronus and the father of Teal'c. He was sent into battle by Cronus and lost. Cronus killed him for it, even though it was an unwinnable battle. Cronus crushed his larval symbiote, which poisoned him, killing him slowly and quite painfully. (SG1: "Crossroads")

In addition Ronac's wife and son were exiled to Chulak. (SG1: "Fair Game")