Long Live Robin Hood (1971)

John Lackland seizes the English throne, believing the rightful ruler, his brother Richard the Lionheart, to be dead. When he learns that Richard is being held captive by the German emperor and can be ransomed for a large sum of money, he refuses to pay and orders the messengers, including Sir Henry of Nottingham, to be killed. Sir Henry escapes to Sherwood Forest, which belongs to his estates. There he joins forces with a group of Anglo-Saxons and fights under the name Robin Hood against the regime of the king's traitors...