>>718036881
Lancelot is the greatest knight because he repented from his sins and went into becoming a monk as a way for redemption, or hunt the sons of Mordred. Similar to how St. Peter became the greatest among the apostles after denying Christ Himself, repenting and leading the Church
If you want the greatest one from a purity perspective that would be Percival/St. John the Apostle. Which ascended to Heaven/was granted by Christ His greatest mysteries and avoided martyrdom.
>>718037079
Or maybe you consume too much pop culture. Well, moving on.