Mortemer Abbey was originally built in 1134 on land gifted to the Cistercians by Henry I of England. The stagnant water of the drainage lake, dug out by the monks to dry up the marshy land around the quick running Fouillebroc stream, was called 'dead mere', 'dead pond' - in modern French 'morte mare' - and gave the monastery its name.
The monks constructed what was then one of the largest Cistercian monastery in the world. Over the centuries, the abbey fell into decline and disrepair. It was rebuilt in the 17th Century, but the decline was irreversible and by 1790, when it was dissolved in the course of the French Revolution, only five monks remained.
The 12th century buildings were already more or less derelict by the time of the French Revolution, and subsequent use as a convenient source of cut stone for local construction reduced them to little more than a ruin. Apart from the cloisters, which are relatively intact, there remains only a shell.
The 17th century buildings by contrast are well preserved and open to visitors, with guided tours available most of the year. The abbey site also has a well-maintained 17th century dovecote, which was also used as a gaol house in the 18th and 19th centuries.
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.