Henry the Young King was born in 1155 and was the son of Henry II of England and Eleanor of Aquitaine. He was crowned as co-king with his father in 1170, but he never ruled independently. His reign was marked by conflicts with his father and his brothers, as he sought more power and territory. Despite his title, Henry struggled to gain authority and faced challenges from both his family and rival factions. He died in 1183 at the young age of 28, leaving behind a legacy of unfulfilled potential and a complicated relationship with his powerful father.