Description: The Castillo de San Marcos is a Spanish built fort located in the city of St. Augustine, Florida. It was known as Fort Marion from 1821 until 1942, and Fort St. Mark from 1763 until 1784 while under British control.
The city of St. Augustine was founded in 1565. Over the next one hundred years, the city was defended by nine wooden forts. Following the 1668 attack of the English pirate Robert Searle, it was decided by the Queen Regent of Spain, Mariana, that a masonry fortification be constructed to protect the city. In October 1672 construction began on the fort that would become the Castillo de San Marcos.