The Stadtkyll Castle was most likely built by the Lords of Blankenheim. In 1469, the County of Blankenheim, and thereby also Stadtkyll, found itself in the ownership of the Counts of Manderscheid, whose armorial tinctures. Stadtkyll was granted town rights in 1310, and thereby also the right to bear arms. They were more or less the same as the ones that the municipality bears today. The bend sinister in the old arms has been made wavy, however, and a silver bendlet has been added to its lower edge, to symbolize that the village's and the castle's surroundings are shaped by their location on the river Kyll.