Doña Isabel II was queen regnant of Spain from 1833 until 1868. She came to the throne as an infant, but her succession was disputed by the Carlists, who refused to recognise a female sovereign, leading to the Carlist Wars. After a troubled reign, she was deposed in the Glorious Revolution of 1868, and formally abdicated in 1870. Her son Alfonso XII became king in 1874.