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Ace, raising him along with his grandson Luffy.
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Prior to Roger's execution, Garp agreed to care for his son, Portgas D. Garp would fight and attempt to capture Roger numerous times after that. The Rocks Pirates were targeting the World Nobles, and thus Garp's actions in the battle earned him the title of "Hero of the Marines". He and Roger teamed up against the Rocks Pirates (of which Whitebeard, Big Mom, and Kaido were all members) in a battle known as the God Valley Incident, which led to the dissolution of that crew.
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Garp has a long history with both Whitebeard and Roger. Chief among them are the deceased Yonko Whitebeard and Luffy's grandfather, Vice Admiral Monkey D. Only a few characters in the series are confirmed to have traded blows with Roger and walked away alive. He is frequently described as the strongest pirate to ever exist, and his execution only possible due to his consent.
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One Piece's title refers to a treasure left behind by Gol D.
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