Teach Marshall マーシャル・D・ティーチ

Blackbeard was formerly a member of the Whitebeard Pirates second division led by Portgas D. Ace. Shanks also warned Whitebeard that Blackbeard was becoming stronger than him and had only joined his crew to stay hidden behind the massive shadow of the Whitebeard name, until he became strong enough to make his move. This time came when Blackbeard murdered a member of the Whitebeard Pirates, thus prompting his departure from the crew, and Ace's hunt for him. Blackbeard was also the one who gave Shanks the scars around his eye, a long time ago. Shanks also tells Whitebeard to call back Ace on his hunt for Blackbeard, as he was concerned about the timing of a confrontation between Ace and Blackbeard.