- Isabel II ruled Spain from 1833 to 1868 but was unpopular. Her governments were dominated by military politicians until they died and the government became too weak. General Prim sent Isabel into exile and sought a new monarch.
- After two years, the Duke of Aosta, Amadeo I, accepted the throne but his reign was extremely unstable, dealing with conflicts between political parties, rebellions, and problems with the army. Unable to cope, he returned to Italy in 1873.
- Spain then became a republic for 11 months but experienced political and social instability along with three civil wars. General Martínez Campos restored the monarchy and Alfonso XII became the new King