Friar Tuck is a hero found in the Scenario Editor in Age of Empires II: The Age of Kings. It is based on a fictional character in English folklore who is a companion of Robin Hood. He is represented by a Monk. As a hero, he cannot be converted and can regenerate health. If he picks up a Relic, an unresolved glitch turns him into a regular Monk.
Like other Monks, Friar Tuck is affected by all upgrades that affect Monks as well as any other bonuses that affect them.