Prague Castle began in the late ninth century when Bořivoj, the first historically documented Přemyslid ruler, established a fortified seat above the Vltava River. A church dedicated to the Virgin Mary stood within the early enclosure, followed by the Basilica of Saint George and a rotunda of Saint Vitus. The stronghold joined princely government to Christian worship and became the center from which the Přemyslid dynasty consolidated Bohemia. Earth-and-timber defenses gradually gave way to stone walls, towers, churches, and residences as the rulers’ authority expanded.

The complex gained wider importance when Prague became a bishopric in 973. The Romanesque palace and religious foundations served dukes and, from the twelfth century, kings of Bohemia. Fire, siege, and dynastic conflict repeatedly damaged the site, yet each rebuilding enlarged it. In 1344, Prague became an archbishopric and construction began on a new Gothic Cathedral of Saint Vitus. King and Holy Roman Emperor Charles IV made the castle an imperial residence, employed architects Matthias of Arras and Peter Parler, and transformed Prague into a leading political and cultural capital.

Later rulers adapted the castle to new forms of court life and defense. Vladislav II created the immense late Gothic Vladislav Hall around 1500 for ceremonies, markets, tournaments, and assemblies. After a major fire in 1541, the Habsburgs rebuilt residential areas in Renaissance form and developed gardens and pleasure buildings north of the walls. The famous 1618 defenestration of royal governors from the Bohemian Chancellery helped ignite the Thirty Years’ War. Although Vienna became the Habsburg monarchy’s primary capital, Prague Castle retained ceremonial and administrative importance.

Empress Maria Theresa ordered a broad eighteenth-century rebuilding that gave the courtyards a more unified palace facade. In the nineteenth century, national interest focused on completing Saint Vitus Cathedral, whose western end and towers were finished in 1929 while incorporating its medieval choir and chapels. After Czechoslovakia was founded in 1918, President Tomáš Garrigue Masaryk chose the castle as the presidential seat. Architect Jože Plečnik reshaped courtyards, gardens, stairways, and state rooms, deliberately adapting a dynastic complex for a modern republic.

The castle was occupied by Nazi authorities during the Second World War and became a seat of communist power after 1948. It returned to democratic presidential use after the Velvet Revolution of 1989, when Václav Havel encouraged new cultural access. Today the Office of the President administers a complex containing Saint Vitus Cathedral, the Old Royal Palace, Saint George’s Basilica, Golden Lane, museums, gardens, and working state rooms. More than a thousand years of continuous rebuilding make Prague Castle less a single fortress than an architectural record of Bohemian monarchy, Habsburg rule, national revival, occupation, and republican government.