Highprince Bethab was a highprince of Alethkar on Roshar. His princedom was in the southwestern corner of Alethkar. He prefers to use mercenary companies for the bulk of his army.  He was considered to be a dullard by Jasnah. 
He coveted the throne and tried at some point to get king Elhokar to sign a contract that would give him a favored claim in a succession. He is married, and when Dalinar wanted to ally with a highprince for a joint plateau assault during the War of Reckoning, Bethab turned him down by letting his wife give the refusal. His army subsequently joined Dalinar's on a successful plateau run.