Palma Cathedral, commonly called La Seu, dominates the waterfront of Mallorca’s capital. Its origin is tied to the conquest of Madina Mayurqa by King James I of Aragon in 1229. Tradition says that during a dangerous crossing he vowed to build a church to the Virgin if his fleet survived. After the conquest, Christian worship was established at the former main mosque, and a new cathedral gradually replaced it. The project also expressed the authority of the new kingdom of Mallorca within a city long shaped by Islamic rule.

Construction proceeded in stages from the thirteenth through the seventeenth century. James II promoted a royal chapel that became part of the eastern end, and the cathedral served both episcopal and dynastic purposes. Builders developed a vast Catalan Gothic interior with three naves, slender piers, high vaults, large windows, and powerful exterior buttresses. The central nave rises to about forty-four meters, among the tallest Gothic naves, creating an unusual sense of open vertical space above the closely spaced supports.

Light is one of La Seu’s defining materials. The enormous eastern rose window, filled with medieval and later stained glass, projects colored patterns into the nave. Around the equinoxes, morning light can align the eastern rose with the opposite wall beneath the western rose, an effect popularly called the festival of light. Chapels, tombs, choir furnishings, portals, and paintings accumulated over centuries. The cathedral’s celebrated view across water also changed when modern roads and a reflecting basin reshaped the shoreline outside the medieval walls.

Earthquakes and structural problems prompted repeated repair, including major work after the earthquake of 1851 damaged the west front. Bishop Pere Campins invited Antoni Gaudí to reorganize the interior in 1904. Working until 1914, Gaudí moved choir elements, improved sightlines and lighting, designed furnishings and lamps, and created the suspended canopy above the high altar. His intervention sought to renew worship rather than install an independent modern artwork. Disagreements ended the commission, but the project became an important bridge between Gothic space and Catalan modernisme.

A further transformation came with Miquel Barceló’s Chapel of the Holy Sacrament, completed and consecrated in the first decade of the twenty-first century. The artist covered walls with a vast textured ceramic environment inspired by the multiplication of loaves and fishes, the sea, and the abundance and violence of nature. Dark stained glass and sculptural surfaces produce an immersive setting distinct from surrounding chapels. Its boldness generated debate, continuing the cathedral’s long pattern of adding contemporary art to inherited sacred fabric.

La Seu remains an active Roman Catholic cathedral as well as a major monument and visitor destination. Conservation teams must monitor stone decay, stained glass, roofs, salt-laden maritime air, structural movement, artworks, and the effects of heavy attendance. Interpretation also needs to acknowledge the Islamic city and mosque displaced after conquest, even though little of that building remains visible. The cathedral’s history is not a quick fulfillment of a 1229 vow but a centuries-long process involving rulers, bishops, guilds, artisans, worshippers, restorers, and artists. Gothic engineering, royal memory, Gaudí’s liturgical reform, Barceló’s ceramic chapel, and continuing ritual coexist within one evolving structure.