About Robin Hood (from Wikipedia):
Robin Hood is a legendary heroic outlaw originally depicted in English folklore and subsequently featured in literature and film. According to legend, he was a highly skilled archer and swordsman. In some versions of the legend, he is depicted as being of noble birth, and in modern retellings he is sometimes depicted as having fought in the Crusades before returning to England to find his lands taken by the Sheriff. In the oldest known versions he is instead a member of the yeoman class. Traditionally depicted dressed in Lincoln green, he is said to have robbed from the rich and given to the poor.
Through retellings, additions, and variations, a body of familiar characters associated with Robin Hood has been created. These include his lover, Maid Marian, his band of outlaws, the Merry Men, and his chief opponent, the Sheriff of Nottingham. The Sheriff is often depicted as assisting Prince John in usurping the rightful but absent King Richard, to whom Robin Hood remains loyal. His partisanship of the common people and his hostility to the Sheriff of Nottingham are early recorded features of the legend, but his interest in the rightfulness of the king is not, and neither is his setting in the reign of Richard I. He became a popular folk figure in the Late Middle Ages. The earliest known ballads featuring him are from the 15th century.