Some sources list his birth date in 1754, (as the date of his baptism) and others in 1767. See (in German) Constantin Wurzbach, "Konstantin Ghilian Karl d'Aspre von Hoobreuk", in Biographisches Lexicon des Kaisertums Oesterreich, Vienna, 1856, B:1 S:77 or "Konstantin Ghilian Karl d'Aspre von Hoobreuk", (in German)Allgemeine Deutsche Biographie, Munchen/Leipzig, Duncker & Humblot, 1875–1912, Band 1 (1875), S. 620–621.