User blog comment:Master Sima Yi/Assassinews 25-03-'13 — Assassin's Creed IV: Black Flag gameplay trailer/@comment-5174994-20130401163709/@comment-4999424-20130401171050

He's either:

Henry Morgen.

Henry Every.

"Black Sam" Bellamy.

Stede Bonnet.

Calico Jack Rackham.

Bartholemew Roberts.

Edward Low.

William Fly.