Şahkulu (Azerbaijani: Şahqulu — «Slave of the Shah»), also known as Karabıyıkoğlu, (died July 2, 1511) was the leader of the pro-Shia and pro-Safavid uprising in Anatolia – the Şahkulu Rebellion – directed against the Ottoman Empire in 1511. He was viewed as a Messiah and Prophet by his followers. His death in battle signified the end of the uprising. He is buried in Amasya.
A fictionalized version of Şahkulu appears in the 2011 video game Assassin's Creed: Revelations, where he is called Shahkulu and serves as an antagonist. In the game, he joins the game's Templar Order at an early age, after being left orphaned by the Ottomans. He survives the Shahkulu Rebellion and is partnered with fellow Templar Manuel Palaiologos, a titular Byzantine heir, in an effort to revive the Byzantine Empire under the Templar banner. He is killed by the game's protagonist, Ezio Auditore da Firenze, in Derinkuyu, Cappadocia in March 1512, where Shahkulu and Manuel are raising an army. He is also included in the game's multiplayer aspect as a character named 'the Renegade'.