The culture of medieval Poland was closely linked to the Catholic Church and its involvement in the country's affairs, especially during the first centuries of the Polish state's history. Many of the oldest Polish customs and artifacts date from the Middle Ages, which in Poland lasted from the late 10th to late 15th century, and were followed by the Polish Renaissance.

The Gniezno Doors are a pair of bronze doors placed at the entrance to Gniezno Cathedral in Gniezno, Poland. They are decorated with eighteen bas-relief scenes from the life of St. Adalbert, whose remains had been purchased for their weight in gold and brought back to, and enshrined in, the cathedral. The cathedral is a Gothic building which the doors predate, having been carried over from an earlier temple. The doors were made around 1175, in the reign of Mieszko III the Old, and are one of the most important works of Romanesque art in Poland.