The late Gothic Saint Gummarus’ Church was built from 1378 onwards to replace its 10th century Romanesque predecessor. Only in 1517 was the high altar consecrated.
It may be considered as one of the most prominent Gothic churches in the Low Countries, and one of the most representative examples of Brabantine Gothic style. The spire is the oldest monumental Brabantine one and also the most unpretentious one: the square switches brutally to the octagon, with a few pinnacles as the only connection. It is striking to see how homogeneous the building is, in spite of a building period of nearly two centuries. Except for a few details all master builders have kept to the 1425 concept, designed by master builder Jan II Keldermans. This is mainly due to the two master builder dynasties Keldermans and de Waghemakere, who were relatives.
Saint Gummarus’ Church is closely related to Saint Rumbold’s Cathedral (Sint-Romboutskathedraal) in Mechelen. The choir especially shows a striking resemblance: its floor plan is a mere copy, with its septilateral partition surrounded by the ambulatory with seven radiating chapels that touch each other. Also the interior is quite similar: round columns with typical Brabantine double cabbage foliage sculpted capitals.
The exterior is plain Brabantine High Gothic: neither too austere, nor too flamboyant.
Besides the Lier collegiate church was clearly inspired by the older French cross-shaped basilicas, but without their staggering verticality. The people of Brabant are satisfied with Heaven on Earth.