Eleuthera

Eleuthera was a fort located on the island of the same name in the Bahamas in the Caribbean. It was one of the ten forts that were captured by the pirate and Assassin Edward Kenway during his pirating career. 

After the fort's capture, a harbormaster's station was built by the docks, and two naval contracts were offered to Kenway by a representative of the Dutch trader Milo van der Graaff. 

Reference

• Assassin's Creed IV: Black Flag