Friar Tuck was a mythological Human who lived in the 12th and 13th centuries on Earth. A companion of Robin Hood, he was part of Robin Hood's band of Merry Men.
When Q forced the senior officers of the USS Enterprise-D to participate in a recreation of Sherwood Forest, Lieutenant Commander Data played the role of Friar Tuck. (TNG episode: "Qpid")
The Robin Hood stories also existed in the mirror universe. (ENT - Mirror Universe short story: "Nobunaga")