Wielkopolski Square reflects the transformations the city has undergone. The site was initially a suburb called Glinki. Clay, or glina in Polish, was extracted by a mill in a waterlogged area along the Bogdanka River for the production of bricks supplied to the growing medieval town. At the start of the 19th century, as the city was being redesigned and expanded beyond its original walls, the site was turned into a green park surrounded by trees. Later, a pond in the northern part of the park was filled. The resulting square was named Sapieżyński after its owners. It was the site of Poznań’s first coffee house. The main part of the square has been a market since the 1870s.