Henry I, Prince of Joinville, Duke of Guise, Count of Eu (31 December 1550 – 23 December 1588), sometimes called
Le Balafré (
Scarface), was the eldest son of
Francis, Duke of Guise, and
Anna d'Este. His maternal grandparents were
Ercole II d'Este, Duke of Ferrara, and
Renée of France. Through his maternal grandfather, he was a descendant of
Lucrezia Borgia and
Pope Alexander VI.