Magdalena 's father , Johann Heinrich Keverich , had been Chef at the court of the Archbishopric of Trier at Festung Ehrenbreitstein fortress opposite to Koblenz .
Johann married Maria Magdalena Keverich in 1767 ; she was the daughter of Johann Heinrich Keverich , who had been the head chef at the court of the Archbishopric of Trier .