Isabella II (Spanish: Isabel; 10 October 1830 – 9 April 1904) was Queen of Spain from 1833 until 1868. She came to the throne as an infant, but her succession was disputed by the Carlists, whose refusal to recognize a female sovereign led 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. Isabella was born in Madrid in 1830, the eldest daughter of King Ferdinand VII of Spain, and of his fourth wife and niece, Maria Christina of Bourbon-Two Sicilies. Queen Maria Christina became regent on 29 September 1833, when her three-year-old daughter Isabella was proclaimed sovereign on the death of the king.

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