Although the St Augustine's Church dates from 1108, a religious presence is thought to have existed at the approximate location for around a century prior to this. The oldest surviving part of the building, the west doorway, dates from c. 1200. The building was enlarged in 1470, when a nave, tower and chancel were added. The church unusually allowed for the wives of deceased clergymen to hold its living– a Katherine Morgan of Llanrumney Hall did so in 1603. The church was extensively refurbished in the late 19th and early 20th Centuries. The churchyard is believed to have been cleared of ancient burials at some point during the mid-19th Century, as no extant stone is older than this. The tower's clock was installed in 1962. Most of the church's stained glass dates from 1915 (the work of Charles Eamer Kempe), though the pair of Te Deum windows were not added until 1950.
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.