The Trier Cathedral, also known as the Liebfrauenkirche, is a Roman Catholic church located in the city of Trier, Germany. It is one of the largest churches in the country and one of the oldest Christian buildings in the world. The cathedral was built in the 4th century, when Trier was the capital of the Roman Empire's western provinces, and is one of the few buildings from this period that has survived to the present day. The cathedral features a mix of Romanesque, Gothic, and Baroque architectural styles and has a rich history, having been the site of many important events and serving as the cathedral of the Archdiocese of Trier for centuries. Today, the Trier Cathedral is a popular tourist attraction and a significant cultural and religious landmark in the city and the region.