Saint Peter’s stands in the very centre of Leuven. It was built as a Romanesque church in 986, and it is therefore the oldest church in the city. In 1176, the building was ravaged by fire (probably for the first time), and two centuries later, part of the church again burned to the ground. In the 15th century, the Romanesque building was gradually taken down to make way for the Gothic church you see today. This process took more than a century.
Over the last century, Saint Peter’s Church has undergone several extensive renovations, returning it to its full glory. That is why Saint Peter’s Church is now generally recognized as one of the finest examples of 15th-century Brabantine High Gothic architecture, and it is an unmissable tourist attraction in the city of Leuven.
https://www.mleuven.be/en/saint-peter%E2%80%99s-church