Fifty-three years ago today, on July 19, 1972 (June 9, 1972 lunar calendar), Franco handed over power to Prince Juan Carlos. Prince Juan Carlos of Spain July 19, 1972. Due to his deteriorating health, Supreme Commander Francisco Franco handed over control of Spain to his personally appointed successor, Prince Juan Carlos de Bauerbon. The 81-year-old head of state who ruled Spain for 35 years retired amid mixed reactions from the public. Many hated Franco's brutal rule and hoped for a new era, while others feared disaster and violent conflict. Franco the Great Dictator