Analysis of information sources in references of the Wikipedia article "Liebfrauenkirche, Trier" in English language version.
Die Geschichte der Liebfrauen-Basilika führt in das Jahr 326 n. Chr. Zum 20-jährigen Regierungsjubiläum machte Kaiser Konstantin große Stiftungen...und eben die Doppelkirchenanlage in Trier, aus der die Hohe Domkirche und die Liebfrauenkirche hervorgegangen sind. (The history of the Basilica of Our Lady leads back to the year 326 AD. On the 20th anniversary of his reign, Emperor Constantine made large endowments ... and also the double church complex in Trier, from which the Hohe Domkirche and the Liebfrauenkirche emerged.)
In the 13th century the early Gothic Liebfrauenkirche was erected next door, adjoining the Romanesque cathedral. Today the two stand as one, sharing a common wall and cloister.
The Church of Our Lady is the earliest church built in French High Gothic style outside France. Its purity of style (it was completed in only 30 years) and the undeviating implementation of the architect's plan for a basilica-shaped graduated central area, for which there were partial models, though no entire prototype in France, probably make it the most perfect example of the centralized construction concept in Gothic style