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One Piece: How Strong is Monkey D. Garp?
One Piece's title refers to a treasure left behind by Gol D. Roger, the late pirate king. He is frequently described as the strongest pirate to ever exist, and his execution only possible due to his consent. Only a few characters in the series are confirmed to have traded blows with Roger and walked away alive. Chief among them are the deceased Yonko Whitebeard and Luffy's grandfather, Vice Admiral Monkey D. Garp.