Altmünster Abbey was a Benedictine monastery on the Plateau Altmünster, between the Fishmarket and Clausen areas of Luxembourg City. It was the first Abbey in Luxembourg City-founded in 1083 by Conrad I, Count of Luxembourg as a private monastery and a religious centre of his county. He appointed his brother Rudolph abbot. The monastery school later received a monopoly on education in the city of Luxembourg and its catchment area reached up to the County of Bar. The children were taught the French and German languages, amongst other things.