Political background, early life and paternity
Alfonso was born in Madrid as the eldest son of Queen Isabella II. Officially, his father was her husband, Infante Francis. Alfonso's biological paternity is uncertain: there is speculation that his biological father may have been Enrique Puigmoltó y Mayans (a captain of the guard). These rumours were used as political propaganda against Alfonso by the Carlists.
His mother's accession created the second cause of instability, which was the Carlist Wars. The supporters of the Count of Molina as king of Spain rose to have him enthroned. In addition, within the context of the post-Napoleonic restorations and revolutions which engulfed the West both in Europe and the Americas, both the Carlistas as well as the Isabelino conservatives were opposed to the new Napoleonic constitutional system. Much like in Britain, which subtracted itself from the liberal constitutional process, Spanish conservatives wanted to continue with the Traditional Spanish Organic Laws such as the Fuero Juzgo, the Novísima Recopilación and the Partidas of Alfonso X. This led to the third cause of instability of note, the "Independence of the American Kingdoms", recognized between 1823 and 1850.