Mästerby Church dates largely from the 13th century. The nave, choir and apse were built first, at the beginning of the century. In the middle of the same century, the tower was also built. The nave was made higher about a century later, and at this time both the nave and choir received vaulted ceilings. The church has remained relatively unaltered since the end of the Middle Ages. Only the sacristy is significantly later, added in 1790. New windows were also made in the 1860s.
The church is richly decorated with frescos internally. They range in period from the 13th to the 17th century. In the apse, some Romanesque paintings survive, notably a depicting of Mary, while some have been covered with other paintings in the 17th century. The vaults in the nave are decorated with frescos from the 14th century, and the walls of the nave furthermore decorated by the artist sometimes referred to as the Master of the Passion of Christ (15th century). Still other frescos, in the choir, probably date from the 16th century, while another set, again in the nave, is dated to 1633.
The baptismal font is from the 12th century, Romanesque in style and a work by the sculptor known by the assigned name Byzantios. The triumphal cross is locally made, dating from the 13th century. Other furnishings date from the time after the Reformation.
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.