St. Lambertus is a Christian saint and martyr, known for his role as the Bishop of Maastricht in the 7th century. He is celebrated for his dedication to spreading Christianity in the region that is now Belgium and the Netherlands. St. Lambertus was killed in 705 AD, and his life is often associated with various miracles and acts of faith. His feast day is observed on November 17, and he is the patron saint of several places, including the city of Liège. Churches dedicated to St. Lambertus can be found in various locations, reflecting his enduring legacy in Christian history.