Infante Juan, Count of Barcelona, was a claimant to the Spanish throne as Juan III. He was the third son and designated heir of King Alfonso XIII of Spain and Queen Victoria Eugenie of Battenberg. His father was replaced by the Second Spanish Republic in 1931. Juan's son Juan Carlos I became king when Spain's constitutional monarchy was restored in 1975.

Alfonso XIII, also known as El Africano or the African due to his Africanist views, was King of Spain from his birth until 14 April 1931, when the Second Spanish Republic was proclaimed. He became a monarch at birth as his father, Alfonso XII, had died the previous year. Alfonso's mother, Maria Christina of Austria, served as regent until he assumed full powers on his sixteenth birthday in 1902.