"Noble Knight", referred to as "Sacred Knight" in the anime and some video games, and known as "Holy Knight" (聖騎士Seikishi) in the OCG, is an archetype of LIGHT and DARKAttributeWarrior-Type monsters. It was introduced in the Yu-Gi-Oh! 5D's Tag Force 5 Strategy Guide and received its first support in Return of the Duelist with "Noble Arms - Gallatin".
All TCG/OCG "Noble Knights", except "Noble Knight Joan", are based on the Knights of the Round Table of Arthurian legend. The "Noble Arms" archetype supports this archetype, and encompasses weapons used by those knights.
The archetype based on three playing styles: Spell/Trap Card control (with the effect of "Noble Arms - Arfeudutyr" and "Artorigus, King of the Noble Knights"), Equip Spells for Warrior-Type monsters with various effects (with 4 released so far), and LIGHT Normal Monsters (1 of them being a Normal Monster itself and 3 treated as one while face-up on the field).