The Cathedral Basilica of the Assumption of the Blessed Virgin Mary and St. Nicholas [1] (Polish: Bazylika katedralna Wniebowzięcia Najświętszej Maryi Panny i św.

[3][4] It is a church located in the old market square, called "Mazowiecki Wawel" resting place of 12 archbishops of Gniezno and primates of Poland.

Originally, this place was a wooden church funded in 1100, probably by Prince Władysław I Herman.

On 25 March 1992, Pope John Paul II created the Diocese of Lowicz, bringing the church to the dignity of the cathedral.

During his Apostolic Journey the Pope visited Łowicz and June 14, 1999, granted the cathedral the title of minor basilica.