Black Flag!

From BoardGameGeek:

In the Caribbean, waves crash under cannon fire: Great Brittonia and the Kingdom of Ibberia battle for dominance of the seas. In disguise, pirates and privateers prepare to strike and seize victory. Hoist the sails and load the cannons: Rule the seas or go down with honor! Each player secretly takes on a hidden role with their own objective - attack your enemies, defend yourself, and use your special abilities to outwit your foes. Pirates, treasure, and surprises keep the game constantly shifting, so bluff, form temporary alliances, and figure out who you can trust. Eliminate your rivals and seize the treasure to win! -description from the publisher