Bitonto Cathedral, dedicated to Saint Mary, was the seat of the small Bishopric of Bitonto from the bishopric's foundation, believed to be in the 8th century, until 1818, when it was combined with the neighbouring Diocese of Ruvo to form the Diocese of Ruvo e Bitonto. This was separated again in 1982, and the Diocese of Bitonto, with Bitonto Cathedral as its seat, was briefly revived, but was combined with the Archdiocese of Bari in 1986 to form the Archdiocese of Bari-Bitonto, in which Bitonto Cathedral is now a co-cathedral.
The remains of a palaeochristian church, which predates by some centuries the establishment of the bishopric, have been discovered underneath the present building.
The existing church however is a Romanesque building of the late 11th-12th centuries, influenced by the Basilica of San Nicola in Bari. The west front is divided into three parts and has three portals (the central one of which is sculpted with plant motifs and scenes from the Old Testament), four mullioned windows and a rose window flanked by sculptures of animals supported by small columns. The interior has a nave and two aisles, and is also notable for its sculpture. The main artwork is the marble ambo, a combined pulpit and lectern, of 1229, a masterpiece of medieval Apulian stonecarving. In the crypt is a tile of a griffin, a survival from the predecessor church building.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.