In Dark Souls, what is the name of the knight whose corrupted legend is explored in the DLC?

In Dark Souls, the knight whose corrupted legend is explored in the DLC is Artorias the Abysswalker.

Artorias is one of the Four Knights of Gwyn and is remembered for confronting the Abyss. The Artorias of the Abyss expansion reveals that the heroic story told in Lordran is incomplete. The player travels into Oolacile’s past and fights Artorias after the Abyss has corrupted him, while the game’s events allow the player to influence how the legend is remembered.

His boss encounter is famous for rapid attacks, powerful leaps, and a temporary self-buff that increases his strength. Artorias fights with a greatsword and moves aggressively across the arena, making the battle one of the expansion’s defining challenges.

Artorias is often mixed up with Manus, Father of the Abyss. Manus is the expansion’s final boss, while Artorias is the legendary knight encountered earlier. Hawkeye Gough is another of Gwyn’s Four Knights and appears in the same historical storyline, but he is not the corrupted knight at the center of the duel.