From Lexicanum

Michaelus Raphael was the Blood Angels First Company Captain around the year 596.M41. He commanded the Blood Angels assault on the space hulk Sin of Damnation, during which a force of eighty Terminators eradicated a force of greater than forty-thousand genestealers. Nothing is known of his origins, or of what becomes of him outside of the confrontation with the Sin of Damnation.¹

Sources

• ¹:Space Hulk Mission Book (3rd Edition)