Palazzo Pitti began in the fifteenth century as the Florentine residence of Luca Pitti, a banker and political rival of the Medici. Construction started about 1458, but the family's resources failed to match the scale of its ambition. The earliest block presented a broad, severely rusticated facade quite different from the vertical tower houses of medieval Florence. The familiar story that Filippo Brunelleschi designed it is not securely documented; modern scholarship more often connects the project with Luca Fancelli. This uncertainty is important because later enlargement obscured the boundaries of the first campaign.

Eleonora di Toledo, wife of Duke Cosimo I de' Medici, purchased the unfinished property in 1549. Bartolomeo Ammannati expanded it around a great courtyard and helped connect the residence to the Boboli hill, where a formal garden became both courtly theater and dynastic landscape. In 1565 Giorgio Vasari's elevated corridor linked the Pitti to the Uffizi and Palazzo Vecchio, allowing the ruling family to move across the Arno without using public streets. The palace became the principal grand-ducal residence and accumulated art, furnishings, tapestries, and ceremonial rooms over successive Medici generations.

After the Medici dynasty ended in 1737, the Habsburg-Lorraine grand dukes remodeled apartments and extended wings, preserving earlier rooms while adapting court life to new taste. Napoleon's government used the palace during French rule. Following Italian unification, the House of Savoy occupied it when Florence served as national capital between 1865 and 1871. Royal apartments therefore combine Medici, Lorraine, Napoleonic, and Savoy decoration rather than presenting a single Renaissance interior. Victor Emmanuel III transferred the palace and its collections to the Italian state in 1919.

The Palatine Gallery developed from the grand-ducal picture collection and retains a display unlike a modern chronological museum. Paintings by Raphael, Titian, Rubens, Pietro da Cortona, and others hang densely within decorated state rooms, arranged for visual and dynastic effect. Fresco cycles, gilded frames, stucco, furniture, and paintings operate as one historic ensemble. The Royal and Imperial Apartments preserve changing domestic and ceremonial uses. Wartime protection, postwar repair, environmental monitoring, and continuing conservation have altered installations, but the massive palace fabric and sequence of rooms remain substantially historic.

Palazzo Pitti is now administered with the Uffizi and Boboli Gardens as part of the Italian state museum system. It houses several collections, while the Palatine Gallery and Royal Apartments communicate the building's central transformation from private banker’s house to grand-ducal palace, royal residence, and public museum. Some spaces periodically close for conservation or reinstallation, so visitor routes can change. The architecture is original Renaissance and later fabric, not a reconstruction, yet many surfaces have been restored and rooms selectively refurnished. Its historical value comes precisely from visible accumulation across five centuries of residence, collecting, government, and museum practice.