In 1833, when, in default of male heirs, his brother Don Carlos claimed the throne, confirmed the Basque fueros, and raised the standard of revolt against his niece, Isabel II.
It was ended by the Convenio de Vergara (August 31st, 1839) in which the concession and modification of the fueros was demanded.
The best works on the various editions of the fueros are Historia de la Legislation.
Marichalar, Marques de Montesa,and Cayetano Manrique; Fueros de Navarra Vizcaya, Guipuzcoa y Alava (Madrid, 2nd ed., 1868); and the Noticia de las cosas memorables de Guipuzcoa, by D.
Having been bred in Castile, where the royal authority was, at least in theory, absolute, he showed himself impatient under the checks imposed on him by the fueros, the chartered rights of Aragon and Catalonia.