One piece: The Fist of Justice

born 13 years before the start of the great pirate, in the year 1485, a young male child is found on a dying island, by a marine. Wounded and injured the great marine stewarded the child away knowing that the world government would insist on eliminating every last sentient being on the island to hide their tragedies. This Marine was none other than Monkey D. Garp! The hero of the marines. Garp takes the young boy in as his own and raises him, in the hopes of strengthening the next generation of Marine heroes. This is the story of black fist- Markus