Calypso

In the world of Pirates of the Caribbean, she is the Goddess of the Sea itself.

History
Though a diety, Calypso fell in love with, then sailor Davy Jones. She offered him the opportunity to visit with her - if he would ferry the dead to other side aboard the Flying Dutchman for ten years.

But, at the end of that time, she was not waiting for him. Jones, heartbroken, cut out his heart and locked it in the Dead Man's Chest. He abandoned his duty, leaving the souls of drowned sailors trapped Davy Jones Locker, or become part of his crew.

Enraged, she cursed Jones - making him and his men become monstrous creatures.

With that, Davy went to the first Brethren Court and they devised a way to subjugate Calypso - trapping her within the body of Tia Dalma.

Calypso's Revenge
Seeking opportunity to escape her earthly prison, Calypso in the form of Tia, grew close to Captain Jack Sparrow, the new Pirate Lord of the Caribbean Sea and helped resurrect the doomed Hector Barbossa.

When the Brethren Court convened to find a way to fight off the East India Trading Company and their fleet led by the Flying Dutchman - it was proposed to free Calypso; assuming she would fight for them out of gratitude (See Pirates of the Caribbean: At World's End).

As the pirates released Calypso, Will Turner told of Jones' plot to imprison her. She repaid Davy's act by creating a massive maelstrom as the Flying Dutchman battled The Black Pearl to decide the fate of all pirates.

In the end, Davy's heart was extinguished, Turner became the Dutchman's new captain and Calypso put the sea at peace.

Game Notes
Calypso does NOT appear in the game, per se. Rather Tia Dalma helps the pirate acquire their voodoo weapons and abilities - so it may be deduced that the game is set prior to her being set free.