[5] There is evidence from a papal bull issued by Pope Innocent II that a wooden monastery of the early Benedictine Brothers pre dated the church by at least a century.

[6] Older excavations and historical analysis suggested that the monastery was founded by Boleslaus I, the first King of Poland, and Saint Adalbert of Prague in approximately 997 AD.

[7] Historian and painter Władysław Łuszczkiewicz noted that the islet (and the nearby mound) served as a small fortified stronghold, or gord.

[7] According to a legend, the local townsfolk from Łęczyca believed that the dimples in stonework were made by the hands of Devil Boruta, who attempted to destroy the church.

Tum defended itself in 1241 during the first Mongol invasion of Poland, but in c. 1293 the army of Vytenis, the pagan Duke of Lithuania, managed to capture the settlement.

During the recapture attempt, German Luftwaffe planes bombed the site which caused more destruction to the roof and internal furnishings leaving an empty shell.