Marie Cécile Henriette Tesch, born in Arlon on 17 August 1841, is one of the seven children of Victor Tesch, a Belgian-Luxembourg industrialist and founding member of ARBED.
In 1870, she married Hubert Muller, a forge master in Esch/Alzette. Together they had four children. From 1904 onwards, the couple lived in the castle "Le Castel" in Messancy. Their castle in Esch/Alzette remains their second home. Their son Edmond Muller-Tesch, who had no descendants, bequeathed Berg Castle to the Red Cross.
Marie Muller-Tesch died on 23 February 1913.
● Ch. Moïs, J.M. Zimmerman and C. Gillet : Demeures et Familles, Section de Messancy, 1ère partie : Les bâtiments Tesch et Castilhon, in: Chroniques n 16, 2004.
● The Tesch family's industries: http://www.industrie.lu/tesch.html