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, and the earliest known ballads featuring him are from the 15th century (1400s).