Gustavia is the main town and capital of the island of Saint Barthélemy. Originally called Le Carénage, it was renamed in honor of King Gustav III of Sweden.
Wikipedia

Saint Barthelemy, a French-speaking Caribbean island commonly known as St. Barts, is known for its white-sand beaches and designer shops. The capital, Gustavia, encircling a yacht-filled harbor, has high-end restaurants and historical attractions like the Wall House, whose exhibits highlight the island?s Swedish colonial era. Perched above town is 17th-century Fort Karl, looking out over popular Shell Beach.
Wikipedia