Shiki the same one who faced Garp and Sengoku 2 VS 1, who was Roger's rival and whitebeard being subordinate to a blackbeard who is much much weaker than him[img=faceslap][img=faceslap][img=faceslap]
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But a pre timeskip luffy defeated him though.
Non-canon history
FictionGoat:But a pre timeskip luffy defeated him though.