St John's Co-Cathedral

Overview

St John’s Co-Cathedral (Kon-Katidral ta’ San Ġwann) is the former conventual church of the Knights of St John, built in the 1570s in the heart of Valletta and now the most visited interior in Malta. From St John’s Square it looks like a fortress chapel: a flat Mannerist front by Girolamo Cassar, two squat bell towers, almost no ornament. Push through the door and the effect reverses completely. Every surface of the single nave is carved, gilded or painted, the vault carries Mattia Preti’s cycle on the life of St John the Baptist, and the floor is a continuous carpet of inlaid marble tombstones under which the knights themselves lie buried.

The church rewards slow walking. Eight langue chapels open off the nave, one for each national division of the Order, and each langue tried to outspend the others on altarpieces and monuments. The Oratory holds Caravaggio’s Beheading of Saint John the Baptist, the largest canvas he ever painted and the only work he signed, alongside his Saint Jerome Writing. A ticket includes an audio guide and the new Caravaggio Centre, so a proper visit takes the best part of two hours, not twenty minutes.

It is still a working Catholic church, shared as an episcopal seat with the older cathedral at Mdina, which is why “co” sits in the name. Sightseeing stops on Sundays and public holidays, when the building returns to worship.

History

The church was the Order of St John’s first great project in its new capital. After the Great Siege of 1565 the knights built Valletta on the Sciberras peninsula, and between 1573 and 1578 their military engineer Girolamo Cassar raised a conventual church at its centre, funded by Grand Master Jean de la Cassière and consecrated on 20 February 1578. Cassar built the way he fortified: the exterior is plain, well proportioned and defensive in spirit, a church for soldiers who had just survived an Ottoman invasion. The Oratory and sacristy followed in 1604.

The interior stayed relatively sober for eighty years. The transformation came with Mattia Preti, the Calabrian painter who arrived in Malta in 1659 and offered to decorate the entire vault with scenes from the life of St John the Baptist. Grand Master Raphael Cotoner accepted, Preti was made a Knight of Grace, and through the 1660s the nave became the Baroque spectacle you see today. Preti never really left: he died in 1699 and is buried in the church he repainted.

Caravaggio’s year in Malta

The Oratory is tied to the most dramatic episode in the building’s history. Caravaggio arrived in July 1607 aboard one of the Order’s vessels, on the run from a murder charge in Rome, and on 14 July 1608 Grand Master Alof de Wignacourt received him as a Knight of Obedience. For the Oratory he painted the Beheading of Saint John the Baptist, roughly 3.6 by 5.2 metres, signing his name in the blood spilling from the Baptist’s neck. Within weeks he was involved in a brawl, locked up in Fort St Angelo, and escaped the island. On 1 December 1608 the assembled knights, meeting in the same Oratory where his masterpiece hung, expelled him as “a rotten and fetid limb” of the Order.

After the Order left Malta the church passed to the local diocese, and in the 1820s the Bishop of Malta was allowed to use it as an alternative seat alongside the cathedral in Mdina, which created the co-cathedral title. The building was slightly damaged by aerial bombing in 1941, though its contents had been evacuated in time, and major restorations ran from the late 1980s onwards, including facade works completed in 2017. The knights who shaped it are still present in the crypt, where early Grand Masters including Jean Parisot de Valette, founder of the city, lie buried.

Visiting

The visitor entrance is on St John’s Square, one block off Republic Street in the centre of Valletta. Opening hours are Monday to Saturday, 09:00 to 16:45, with last entry at 16:00. The church is closed to sightseeing on Sundays and public holidays. Admission is 15 euro for adults, 12 euro for seniors and students, and free for children under 12 accompanied by an adult. An audio guide is included in the ticket and comes in 11 languages: Maltese, English, Italian, French, German, Spanish, Polish, Japanese, Russian, Bulgarian and Romanian.

The natural route runs down one side of the nave through the langue chapels, then back up the other. The nine chapels belong to the Order’s national langues plus the Chapel of Our Lady of Philermos: Provence (St Michael), Auvergne (St Sebastian), France (the Conversion of St Paul), Italy (the Immaculate Conception and St Catherine), Germany (the Epiphany), Castile, Leon and Portugal (St James), Aragon (St George) and the Anglo-Bavarian chapel, which holds the relics. Save the Oratory for last and give the Beheading time: it is hung in the room it was painted for, which is rare for any Caravaggio.

The Caravaggio Centre and the museum works

The Caravaggio Centre opened in 2024 and is included in the standard ticket at no extra cost. It pairs life-size projections of the Beheading with displays on Saint Jerome Writing, an audio-visual narrative of the painter’s life, and a section on the diagnostic science used to study the canvases, from infrared reflectography to UV imaging. In May 2026 it won the international digital category at the Museums + Heritage Awards, the first such win for a Maltese institution.

The main cathedral museum, home to the Order’s Flemish tapestries after a 16 year conservation project, is currently closed for a large extension and refurbishment, with the project still under way as of this writing. Check the official site before visiting if the tapestries are your priority.

Tips

Dress for a working church. Shoulders and knees should be covered, and the foundation asks visitors to bring a shawl to cover up if needed. Stiletto and narrow heels are banned outright, because point loads damage the marble tombstones you will be walking on. Flat shoes are the practical choice anyway: you spend the whole visit on an engraved floor.

Photography without flash is fine; flash, video and audio recording are not allowed without written consent. Wheelchair users can access the church, though some areas remain restricted.

Plan around the Sunday closure: if you only have a weekend in Valletta, the cathedral is a Saturday job. It also combines naturally into one walking day with the Grand Master’s Palace a few minutes up Republic Street, Fort St Elmo at the tip of the peninsula and the Upper Barrakka Gardens overlooking the harbour, all within the walls of the Valletta and the Grand Harbour region’s compact capital.