Sineperver Sultan performed Valide Sultan's obligations as de facto co-ruler of the Ottoman Sultan for fourteen months from 29 May 1807 until 28 July 1808. She was responsible for his education, but Mustafa preferred to live a life of pleasure instead of focusing on his studies. Her regency culminated by the deposition of Mustafa IV as a result of an insurrection led by Alemdar Mustafa Pasha on 28 July 1808.