Korsbetningen was a site of the battle between Danish King Valdemar Atterdag’s army and Gotlanders, fought on 27th July, 1361. Approximately 1800 peasants were slaughtered in the battle and buried to the field. There is a medieval, Gothic-style stone cross with Latin inscription: "AD 1361, third day after the Jacob’s day, fell Gotlanders into the hands of Danish in front of Visby gates. They are buried here. Pray for them."
References:More information about Battle of Visby: https://en.wikipedia.org/wiki/Battle_of_Visby
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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.