The term "Carlistas" refers to supporters of the Carlist movement in Spain, which emerged in the early 19th century. This movement advocated for the claims of the House of Bourbon to the Spanish throne, specifically supporting Carlos María Isidro de Borbón as a rival to Isabella II. The Carlists sought to establish a traditional monarchy based on conservative and regionalist principles. Carlist conflicts, known as the Carlist Wars, occurred primarily in the 19th century, with the first war starting in 1833. The movement was characterized by its opposition to liberalism and its desire to maintain Catholic values and regional autonomy, particularly in Catalonia and the Basque Country. The Carlist legacy continues to influence some political groups in Spain today.