Founding by Pedro Menéndez de Avilés
Founded in 1565 by the Spanish conquistador Pedro Menéndez de Avilés, St. Augustine is the oldest continuously occupied settlement of European origin in the contiguous United States. It is the second-oldest continuously inhabited city of European origin in a United States territory, after San Juan, Puerto Rico (founded in 1521).
In 1560, King Philip II of Spain appointed Menéndez as Captain General, and his brother Bartolomé Menéndez as Admiral, of the Fleet of the Indies. Thus Pedro Menéndez commanded the galleons of the great Armada de la Carrera, or Spanish Treasure Fleet, on their voyage from the Caribbean and Mexico to Spain, and determined the routes they followed.
In early 1564, he asked permission to go to Florida to search for La Concepcion, the galeon Capitana, or flagship, of the New Spain fleet commanded by his son, Admiral Juan Menéndez. The ship had been lost in September 1563 when a hurricane scattered the fleet as it was returning to Spain, at the latitude of Bermuda off the coast of South Carolina. The Crown repeatedly refused his request.
The Crown eventually approached Menéndez to fit out an expedition to Florida on the condition that he explore and settle the region as King Philip's adelantado, and eliminate the Huguenot French, whom the Catholic Spanish considered to be dangerous heretics.
Menéndez was in a race to reach Florida before the French captain Jean Ribault, who was on a mission to secure Fort Caroline. On August 28, 1565, the feast day of St. Augustine of Hippo, Menéndez's crew finally sighted land; the Spaniards continued sailing northward along the coast from their landfall, investigating every inlet and plume of smoke along the shore. On September 4, they encountered four French vessels anchored at the mouth of a large river (the St. Johns), including Ribault's flagship, La Trinité. The two fleets met in a brief skirmish, but it was not decisive. Menéndez sailed southward and landed again on September 8, formally declared possession of the land in the name of Philip II, and officially founded the settlement he named San Agustín (Saint Augustine). Father Francisco López de Mendoza Grajales, the chaplain of the expedition, celebrated the first Thanksgiving Mass on the grounds. The formal Franciscan outpost, Mission Nombre de Dios, was founded at the landing point, perhaps the first mission in what would become the continental United States.
The mission served nearby villages of the Mocama, a Timucua group, and was at the center of an important chiefdom in the late 16th and 17th century. The settlement was built in the former Timucua village of Seloy; this site was chosen for its strategic location facing the waterways of St. Augustine bay with their abundant resources, an eminently suitable site for water communications and defense.
A French attack on St. Augustine was thwarted by a violent squall that ravaged the French naval forces. Taking advantage of this, Menéndez marched his troops overland to Fort Caroline on the St. Johns River, about 30 miles (50 km) north. The Spanish easily overwhelmed the lightly defended French garrison, which had been left with only a skeleton crew of 20 soldiers and about 100 others, killing most of the men and sparing about 60 women and children. The bodies of the victims were hung in trees with the inscription: "Hanged, not as Frenchmen, but as "Lutherans" (heretics)". Menéndez renamed the fort San Mateo and marched back to St. Augustine, where he discovered that the shipwrecked survivors from the French ships had come ashore to the south of the settlement. A Spanish patrol encountered the remnants of the French force, and took them prisoner. Menéndez accepted their surrender, but then executed all of them except a few professing Catholics and some Protestant workers with useful skills, at what is now known as Matanzas Inlet (Matanzas is Spanish for "slaughters"). The site is very near the national monument Fort Matanzas, built in 1740–1742 by the Spanish.