Ferdinando de' Medici, Grand Prince of Tuscany

Ferdinando de' Medici, Grand Prince of Tuscany (9 August 1663 – 31 October 1713) was the son of Cosimo III de' Medici, Grand Duke of Tuscany and Marguerite Louise d'Orléans. Ferdinando was heir to the Grand Duchy of Tuscany, with the title Grand Prince from his father's accession in 1670 until his death in 1713. He married Violante Beatrice of Bavaria in 1689 but the marriage remained childless. He died of syphilis aged 50. 
His older brother Gian Gastone de' Medici, then became Grand Prince and later was the Grand Duke of Tuscany.