Alfonso,_Prince_of_Asturias_(1907–1938)--Ferdinand_II_of_Aragon

Alfonso, Prince of Asturias (10 May 1907 – 6 September 1938), was heir apparent to the throne of Spain from birth until the abolition of the monarchy in 1931. He renounced his rights to the defunct throne in 1933. Alfonso was the eldest son of King Alfonso XIII of Spain and his wife, Victoria Eugenie of Battenberg.
Alfonso's renunciation of his rights as heir to the Spanish throne in order to marry Cuban commoner Edelmira Sampedro caused controversy at the time. A similar situation would take place three years later in Britain with his second cousin Edward VIII, who would abdicate as King of the United Kingdom and Emperor of India to wed American divorcee Wallis Simpson.He died at the age of 31 as a result of a car crash. Though appearing to have sustained minor injuries, his haemophilia, inherited through his great-grandmother Queen Victoria, led to fatal internal bleeding.