Maria was a double third cousin of Johann Haerig. Nikolaus Diederich of Retterath was a witness at her baptism. Her date of death was provided by Peter Bauer. Villa Treveringi, also called Triererhof, is on the edge of Retterath. It formerly belonged to the archbishop-elector of Trier.

Johann’s estimated year of birth is from Peter Bauer. Johann lived in Arbach, Triererhof [Villa Treveringi], and Retterath. His date of death is from the internet site of Schuele Kelberg.