Originally known as San Marcos de Apalache and centered on a Spanish fort, this town was founded by the Spanish in the 17th century in what was then Spanish Florida. There was a trading post of Panton, Leslie & Company in the late 18th century. A long time has passed since St. Marks last had appreciable importance, but this place on Apalachee Bay in Florida's Big Bend is a very old and historic Gulf port. Fortifications built here by the Spanish in the 17th century, and rebuilt several times, provided the venue for force of arms repeatedly up through the American Civil War.