Prince A'tor was the son of the last High King of Hammerfell, Thassad II. After his father's death in 2E 862, the Forebear faction took control of Sentinel, the capital of Hammerfell. Prince A'tor rallied his Crown supporters at his principality of Stros M'Kai and launched a bloody attempt to recapture the city by sea. However, he was taken by surprise by Tiber Septim's assistance of the Forebears, and was eventually defeated by their combined forces at the Battle of Hunding Bay, near Stros M'Kai. His soul was later fused with his longsword to create the Soul Sword, which was instrumental in liberating the island of Stros M'Kai from the clutches of Lord-Admiral Richton.