The 400th anniversary of the founding of St. Augustine, Florida took place in 1965, marking four centuries since the city's establishment by Spanish explorer Pedro Menéndez de Avilés in 1565. As the oldest continuously inhabited European-established settlement in the continental United States, St. Augustine has a rich history that reflects the cultural influences of Spain, Britain, and the indigenous peoples of the region. Celebrations for this milestone included various events, such as parades, historical reenactments, and cultural exhibitions. The anniversary highlighted the city's historical significance and its role in the development of Florida and the broader United States, attracting visitors and historians alike.