The first written mention of the aristocratic seat of Haus an der Aa dates from around 1030. Around 1120, Bernhard von Diepenheim had Ahaus Castle built where Ahaus Castle stands today. In 1154 his son Lifhard called himself von Ahaus for the first time.
The aristocratic seat of Haus an der Aa's origins are documented in writing around 1030. Around 1120, Bernhard von Diepenheim built Ahaus Castle where it stands today. In 1154, his son Lifhard first used the title "von Ahaus."