St John's Co-Cathedral

St John's Co-Cathedral stands on St John Street in Valletta, Malta, and is the principal monument of the Order of St John, whose knights ruled the islands from 1530 to 1798. The church was built between 1572 and 1577 to designs by the Maltese military architect Girolamo Cassar, shortly after the Great Siege of 1565 and the founding of Valletta as a fortified capital. Its exterior is deliberately austere, resembling a fortress with two bell towers and a plain limestone facade, which contrasts sharply with the interior. From the 1660s the painter and knight Mattia Preti covered the barrel-vaulted nave with scenes from the life of St John the Baptist, carved directly into the soft Maltese limestone and then painted, creating one of the most complete Baroque interiors in Europe. The floor is made up of around 400 inlaid marble tomb slabs commemorating knights, with allegorical figures of death, time and glory. Each of the eight langues of the Order, grouped by language and origin, had its own chapel, richly decorated with altarpieces, sculpture and monuments to Grand Masters. The Oratory contains Caravaggio's Beheading of Saint John the Baptist, painted in 1608 during his stay in Malta and the only work he signed; the adjoining Oratory also holds his Saint Jerome Writing. The cathedral museum displays Flemish tapestries based on Rubens designs, silver and illuminated choir books. The building became a co-cathedral in 1816, sharing status with the cathedral at Mdina. It survived the Second World War, though bombing damaged parts of the complex in 1942. A major restoration programme, led by the St John's Co-Cathedral Foundation, has cleaned and conserved the marble floor, the Preti ceiling and the Caravaggio paintings since the 1990s, and the work continues in phases. The visit is arranged as a self-guided circuit with a multilingual audio guide, taking visitors through the nave, the chapels, the oratory and the museum.