Isabella II succeeded her father when he died in 1833. She was only three years old and Maria Cristina, her mother, served as regent. Maria knew that she needed the support of the liberals to oppose Don Carlos so she granted a constitution in 1834. Don Carlos found his greatest support in Catalonia and the Basques country because the constitution centralized the provinces thus denying them the autonomy they sought. He was defeated and fled the country in 1839. Isabella was declared of age in 1843 and she married her cousin Francisco de Asis, the son of her father's brother, on 10 October 1846. A military revolution broke out against Isabella in 1868 and she was deposed on 29 September. She abdicated in favor of her son, Alfonso, in 1870, but Spain was proclaimed a republic for a brief time.