Castelo de São Jorge boasts a history that stretches back to the Iron Age, with archaeological evidence suggesting early human occupation of the site. The Romans and Visigoths also left their mark, but it was the Moors who built the first substantial fortifications in the mid-11th century. In 1147, Afonso Henriques, the first King of Portugal, captured the castle from the Moors, transforming it into a royal residence.
Throughout the Middle Ages, Castelo de São Jorge served as the center of Portuguese power. It was here that kings resided, decisions were made, and foreign dignitaries were received. The castle underwent significant renovations and expansions during this period, reflecting its importance. In the 16th century, the royal court moved to the Ribeira Palace, and the castle gradually lost its primary function. The 1755 Lisbon earthquake caused significant damage to the structure, leading to extensive restoration work in the 20th century.
Today, Castelo de São Jorge stands as a symbol of Portuguese history and resilience, attracting visitors from around the world.