User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-413232-20140805144635/@comment-13471981-20140805145830

Fort de Sable doesn't seem like it'd have anything to do with Robert de Sable to be honest, as  he was called Robert de Sablé historically. I think it's just a coincidence.