Philip II of Spain ordered Pedro Menéndez de Avilés to protect the interests of Spain by attacking the French at Fort Caroline. On September 20, 1565, a Spanish force from the nearby Spanish settlement of St. Augustine attacked Fort Caroline, and killed nearly all the French soldiers defending it. The Spanish renamed the fort as "San Mateo" and, following the expulsion of the French, St. Augustine became the most important European settlement in Florida. The location of Fort Caroline is subject to debate, but a reconstruction of the fort was established in 1964 along the St. Johns River.