Juan played no part in the 1860 Carlist rising led by his brother
Carlos Luis. On 21 April Carlos Luis was captured by the troops of
Isabella II and forced to renounce his claims to the Spanish throne. On 2 June Juan published a declaration affirming his accession as
Juan III, King of Spain; henceforward he used the title
conde de Montizón (in commemoration of a commandery of the
Order of Santiago which belonged to his father). Juan's accession declaration used phrases such as "the light and progress of the age"; these phrases caused great offence to many Carlists most of whom refused to support him. Once he had left Spain, his brother Carlos Luis renounced his abdication. On 15 June he declared that it was invalid since he had been forced to sign against his will. Juan refused to accept his brother's declaration. Until the unexpected death of Carlos Luis the following January, there were two Carlist claimants. During the early 1860s the popularity of the government of Isabella II continued to decline. Juan's liberal views, however, ensured that he was not a viable candidate for the Carlists. In 1866, Juan's elder son Carlos (now aged eighteen) asked his father to renounce his rights, but he did nothing. Two years later, however, on 3 October 1868, Juan signed a decree of abdication at
Paris. He became an active supporter of his son Carlos' attempts to regain the Spanish throne in the
Third Carlist War. == Claimant to the throne of France ==