Pilgrim

The Pilgrim was one of the Legendary Ships encountered by the Templar Shay Cormac in the North Atlantic. The Pilgrim and her sister ship, the Cauldron were one of the few pirate vessels left after the decline of the Golden Age of Piracy. She and her sister ship were sunk by Cormac's ship, the Morrigan in naval combat.

Reference

 * Assassin's Creed: Rogue