Queen Isabella II of Spain formally abdicates

Background. Isabella II was the only queen regnant in unified Spanish history, reigning from 1833 until her deposition in 1868. Her rule ended following the Glorious Revolution, which began with a naval mutiny in Cádiz in September 1868. The revolutionary forces defeated her troops at the Battle of Alcolea, leading to the definitive demise of her 35-year reign and her subsequent exile in France.

Formal Abdication. On 25 June 1870, Isabella renounced her dynastic rights in Paris in favor of her son, Alfonso. The official declaration stated that the renunciation was made "freely and spontaneously," though historical sources indicate she was forced to do so. This act formalized the transfer of her claim to the Spanish throne to her son, who was then in exile.

Political Context. Following the abdication, the Spanish throne was offered to Amadeo of Savoy in November 1870. Isabella remained in France, where she resided until her death in 1904. In 1871, she reconciled with her brother-in-law, the Duke of Montpensier, who assumed the political management of the family, signaling a shift in the internal dynamics of the deposed monarchy.