Abtei Prüm
In 806, "Villa Wallemaresdorp" had its first documentary mention in a document dealing with a donation to Prüm Abbey; however, it is not universally agreed that this is a reference to Walsdorf. It is certain, though, that there were landholdings on the Arensberg (mountain) in 1023. In 1353, a "Centerei Walsdorf" (“tithing centre of Walsdorf”). On 17 March 1974, the formerly self-administering municipality of Zilsdorf was amalgamated with Walsdorf.