The Church of the Trinity and San Giovanni is a Romanesque and Pisan-style building from the 11th century. In the church's chapel, two murals depicting Doctors of the Church and Saint George slaying the dragon date from 1449 and 1458 respectively. In 2011, an archaeological evaluation was carried out on the church's nave in favor of a restoration campaign.
Like the chapels at Montegrosso and Lumio, the chapel is located in the center of the cemetery and is decorated with human and animal figures (including bears, oxen and snakes). One example is in the pinion in the vertical alignment of the door: it depicts a man removing a thorn from his foot; this is an allegory of knowledge and is fairly widespread in Romanesque buildings.
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.