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. In the Definitive Edition, he cannot pick up Relics: in prior versions, a glitch will turn him into a regular Monk on picking one up.
Like other Monks, Friar Tuck is affected by all upgrades that affect Monks as well as any other bonuses that affect them.