The Marquis de Montalban is the main antagonist of Sid Meiers Pirates!.
The hero's family owed a large debt to the Marquis and sent a fleet of riches to him. However, the fleet was lost and Montalban enslaved the family, excluding the hero who escaped, vowing revenge. Once the hero came of age, he joined the crew of a ship. Because of the bad treatment given by the captain, the hero lead a mutiny which he won. He then took over the ship and began his life of piracy and his journey to find his family and defeat the Marquis de Montalban.
Eventually, he tracks down Montalban to his stronghold and a battle ensues. The hero defeats the Marquis. In exchange for his life he gives the hero all his stolen money and becomes his cabin boy.