Fárbauti was, in Norse mythology, King of the Frost Giants of Jotunheim and the biological father of Loki. Fárbauti fathered Loki, Byleistr, and Helblindi by Laufey, another Jotunn. His name means "Cruel Striker."
He was a frequent enemy of King Odin of Asgard, fighting several wars against Asgard before he was decisively defeated by Odin at the 965 AD Battle of Tonsberg, after which Odin took the Casket of Ancient Winters from him and prevented him from creating a second ice age on Midgard (Earth). Afterwards, Fárbauti was forced to agree to a truce to end the last great war between Jotunheim and Asgard, although he would later ally with his son Loki (who had been adopted by Odin) and attempt to avenge his defeat. Loki used the Frost Giants' invasion of Asgard to rally support behind him, killing Fárbauti just before he could stab a paralyzed Odin while he was in "Odinsleep".