The Collegiate Church of St. Florian was built between 1185 and 1216. It was burnt down many times in the 12th, 16th and 17th centuries. Notably, during the Swedish siege of Kraków, General Stefan Czarniecki ordered the city's suburbs burned down. However, during the city-wide fire which consumed a considerable part of Kraków in 1528, the church – containing St. Florian's relics – survived. Since then St. Florian, usually portrayed as a Roman legion officer carrying water, has been revered in Poland as patron saint of firefighters and chimneysweeps. The church's present appearance is the result of a Baroque renovation after the Polish-Swedish wars.
Since the 16th century the Church has been the University Collegiate. The coronation route began there, with the rector of the university senate welcoming new kings. The Church was also the starting point for royal funeral processions to Wawel Cathedral.
In 1667 the remains of Queen Ludwika Maria Gonzaga, wife of King Jan II Kazimierz, were placed there temporarily, and in 1818 the remains of Tadeusz Kościuszko were placed there. From 17 September 1949 to September 1951, Father Karol Wojtyła, who later became Pope John Paul II, worked there as a vicar. As Pope, in 1999 he elevated the Church to a minor basilica.
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.