Holywood Priory was founded by St. Laiseran before 640 on the site of the present ruins of the medieval Old Priory. The present ruins are 12th century Anglo-Norman Augustinian Abbey built by Thomas Whyte and much of these ruins remain. After the Black death (1348-1350) Niall O’Neill refurbished the church for the Franciscan Order.
The Priory was dissolved on New Years Day, 1541, by Henry VIII with its lands passing into the hands of the O’Neill family and then to Sir James Hamilton, First Viscount Clandeboye. Hamilton laid out the town, with a maypole at the crossroads and most of the early buildings are clustered round the Priory. The tower dates from the 1800’s when this was the site of the town’s Parish Church.
The adjoining burial ground has been used for centuries. Scottish settlers who arrived with the Hamilton/Montgomery Plantation in the early 17th century are buried here, though the earliest surviving gravestone is from 1645.
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.