San Fermo Maggiore is a medieval Romanesque church. A church at this site may has been traced to the 8th century, and by the 11th century a second story and belltower was added by the Benedictine order. The campanile was not completed until the 13th century, it contains six bells in F cast in 1755 and rung with the Veronese bellringing art. The exterior has a roofline with pinnacles, and the church once held the tomb of a member of the Scaligers. The interior has later decoration, including an altarpiece of St Francis of Assisi by Giovanni Battista Belloti. The presbytery hosts relics of the saints Fermo and Rustico.
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.