Having lost his parents as a child, he was raise by the fairy of the lake Nimue and thus gained the alias "Knight of the Lake".
Upon reaching adulthood, he crossed over to the Isle of Britain and, after meeting with King Arthur, joined the Knights of the Round Table. It has been said that none could compare to his valor and chivalric mentality.
For him to surrender himself to his feelings towards Queen Guinevere was an inevitable outcome for his chivalry. If his treachery towards the king was promptly met with ruin, he would probably have been saved. However, because his valor was peerless, this situation brought about the worst possible outcome.
Rank: A Type: Anti-Unit
Knight of Owner.
An Ability Noble Phantasm that implements the attributes of "one's own Noble Phantasm" to anything he puts his hands on. No matter what armament, no matter what kind of weapon becomes a pseudo-Noble Phantasm equivalent to D Rank.
Martial dexterity that reached the point of being boasted as peerless in a given era.
By complete unification of heart, technique and physique, it is possible to display one's former combat power even while under the influence of any kind of mental restriction.
The tenacity of a knight who feel in the depths of regret despite being bathed by too much honors; especially due the feelings of love and hate pointed towards the King and the Queen that can never reach an answer, he continues to be imprisoned by eternal madness.
The black knight continues to fight, seeking the sole meeting that might appease his agony.
He, Heracles, and Beowulf share the exact HP values (at both minimum and maximum).