St. Johns Co-Cathedral was built by the Knights of Malta between 1573 and 1578, having been commissioned in 1572 by Grand Master Jean de la Cassière as the conventual church of the Order of the Knights Hospitaller of St John, known as the Knights of Malta. The Church was designed by the Maltese military architect Glormu Cassar who designed several of the more prominent buildings in Valletta. The church is considered to be one of the finest examples of high Baroque architecture in Europe and one of the world's great cathedrals.
The interior, in sharp contrast with the facade, is extremely ornate and decorated in the height of the Baroque period. The interior was largely decorated by Mattia Preti, the Calabrian artist and Knight. Preti designed the intricate carved stone walls and painted the vaulted ceiling and side altars with scenes from the life of St John. Interestingly, the figures painted into the ceiling next to each column initially appear to the viewer as three-dimensional statues, but on closer inspection we see that the artist cleverly created an illusion of three-dimensionality by his use of shadows and placement.The Maltese limestone from which the Cathedral is built lends itself particularly well to such intricate carving. The whole marble floor is an entire series of tombs, housing about 375 Knights and officers of the order. There is also a crypt containing the tombs of Grandmasters like Philippe Villiers de L'Isle-Adam, Claude de la Sengle, Jean Parisot de Valette, and Alof de Wignacourt.
In 1666, a project for the main altar by Malta's greatest sculptor, Melchiorre Cafà, was approved and begun. Cafà intended a large sculpture group in bronze depicting the Baptism of Christ. Following Cafà's tragical death in 1667 in a foundry accident while working on this work in Rome, the plans were abandoned. Only in 1703, Giuseppe Mazzuoli, Cafà's only pupil, finished a marble group of the Baptism of Christ which might have been influenced by his master's undocumented designs but certainly is strongly dependent on a small baptism group by Alessandro Algardi.
The Cathedral contains eight rich chapels, each of which was dedicated to the patron saint of the 8 langues (or sections) of the Knights.
The painting depicting The Beheading of Saint John the Baptist (1608) by Caravaggio (1571–1610) is the most famous work in the church. Considered one of Caravaggio's masterpieces and the only painting signed by the painter, the canvas is displayed in the Oratory for which it was painted. Restored in the late 1990s in Florence, this painting is one of Caravaggio's most impressive uses of the chiaroscuro style for which he is most famous with a circle of light illuminating the scene of St John's beheading at the request of Salome. The oratory also houses Caravaggio's St Jerome III (1607–1608).
Another impressive feature of the church is the collection of marble tombstones in the nave in which were buried important knights. The more important knights were placed closer to the front of the church. These tombstones, richly decorated with in-laid marble and with the coats of arms of the knight buried below as well as images relevant to that knight, often telling a story of triumph in battle, form a rich visual display in the church.
Adjoining to the church is the St John's Co-Cathedral Museum containing art objects. Among the contents of the museum there are the Tapestries of Grandmaster Fra Ramon Perellos de Roccaful, paintings of the following Grandmasters Fra Jean de la Cassiere, Fra Nicola Cottoner and Fra Emanuel Pinto de Fonseca, painting which were formerly in the side chapel such as St. George killing the Dragon by Francesco Potenzano.
References:Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).