King Henry II and his queen, Eleanor of Aquitaine, had five sons. Their first son died in infancy. The second son's name was Henry, the third's Richard, the fourth's Geoffrey and the fifth's John.
Hi, I'm Richard.
Henry II decided to give Aquitaine to John, his favourite son. Richard, having ruled Aquitaine for over a decade, was not willing to relinquish his control over it; Aquitaine was arguably second only to Normandy in its wealth and importance.
You can't have my land!
Aquitaine is all yours John.
This set in motion years of conflict between father and son.
Farther picks favourites.
By the summer of 1189, Richard had joined forces with the King of France, Philippe II. He was fighting to retain Aquitaine while insisting that Henry formally name him as successor.
How could you betray me?!?!
Henry II fell gravely ill and agreed to surrender and recognize Richard as his heir. Henry died shortly after (due to his illness) on the 6th of July 1189 at the age of 56, at Chinon.
At that time, Richard was officially proclaimed King of England, pending his formal coronation. He immediately sent urgent orders to England to release his mother, Eleanor, who had been held prisoner by King Henry since the Great Revolt of 1173-1174.