Monkey D. Garp is an extremely famous and powerful Marine vice admiral. He is the father of Monkey D. Dragon, the paternal grandfather of Monkey D. Luffy, and the adoptive grandfather of Portgas D. Ace. He was responsible for overseeing Ace's birth and raising a young Luffy, before entrusting them both to the Dadan Family. His feats as a Marine soldier were met with immense notoriety and prestige, with his actions during one incident in particular bestowing him the title of Hero of the Marines.