Religion: Christian (medieval)
Name: The Black Knight
Alter Ego: Sir Eobar Garrington
First Appearance: The Defenders (vol. 1) #11 (Dec. 1973): "A Dark and Stormy Knight"
Super? (Has Super Powers/Special Abilities/Technology): Yes
Number of Appearances: 11
Ally: King Richard
Ally: Prestor John
Note: Black Knight during Crusades
Sir Eobar Garrington was the Black Knight of the Crusades. His mind was possessed for quite some time (including the last five years of his life) by the spirit of Dane Whitman, the contemporary (20th Century) Black Knight.
Suggested links for further research about this character and the character's religious affiliation: