Spanish admiral Pedro Menéndez de Avilés formally established San Agustín (St. Augustine) near the Timucua town of Seloy, creating the long-term administrative center of Spanish Florida.
Menéndez’s forces captured the French Huguenot outpost Fort Caroline near today’s Jacksonville, eliminating a major European rival in the region and strengthening Spain’s hold on Florida’s Atlantic coast.
French survivors (including Jean Ribault and his party) who surrendered at Matanzas Inlet were executed by Spanish forces; the event helped cement Spanish control and gave the inlet its enduring name (“matanzas,” slaughters).
A formal Franciscan mission, Nombre de Dios, was founded at St. Augustine’s early landing area, becoming a key institution in Spanish Florida’s religious life and colonial-Native relations.
An English-led privateering force under Robert Searle sacked St. Augustine, underscoring the vulnerability of Spain’s wooden defenses and the intensifying imperial conflict on Florida’s frontier.
England and Spain concluded the Treaty of Madrid (1670), aiming to reduce colonial depredations and stabilize imperial competition in the Americas—an important diplomatic backdrop to Florida’s ongoing militarization.
Spain broke ground for the Castillo de San Marcos—a coquina stone fortress built to replace earlier wooden works and to secure St. Augustine against escalating English and privateer attacks.
After more than two decades of labor and supply challenges, the main work on the Castillo’s core was completed, giving Spanish Florida its most formidable defensive structure and a refuge for residents during sieges.
A Carolina expedition under James Moore besieged St. Augustine; the town was badly damaged, but the Castillo de San Marcos held, confirming the strategic value of Spain’s masonry fortifications.
Former Carolina governor James Moore led a major 1704 campaign in Apalachee Province that destroyed multiple missions and depopulated wide areas, accelerating the contraction of Spanish Florida toward St. Augustine and Pensacola.
Governor Manuel de Montiano established Gracia Real de Santa Teresa de Mosé (Fort Mose) north of St. Augustine, a legally sanctioned free Black community whose militia strengthened the city’s northern defenses.
During the War of Jenkins’ Ear, James Oglethorpe blockaded and bombarded St. Augustine; Spanish defenses and resupply via the Matanzas route helped the town endure until the British lifted the siege.
Spain completed Fort Matanzas (Torre de Matanzas), a coquina fortification designed to control Matanzas Inlet—an approach used during the 1740 siege that bypassed St. Augustine’s main harbor defenses.
The Treaty of Paris (1763) ended the Seven Years’ War; Spain ceded East and West Florida to Great Britain, ending the First Spanish Period in Florida and shifting St. Augustine into the British imperial system.
Spanish Florida: St. Augustine and Colonial Presence (1565–1763)
