Klemens von Metternich and his second wife, Baroness Maria Antonia von Leykam (15 August 1806 – 17 January 1829). His mother died 10 days after the birth
Alps Central, London: Alpine Club, 1975 Kugy, Julius, Im göttlichen Lächeln des Monte Rosa, Graz: Leykam-Verlag, 1940 The Monte Rosa group on SummitPost
Birgit Strimitzer (eds.): Der Souveräne Malteser-Ritter-Orden in Österreich, Leykam, Graz, 1999, ISBN 3-7011-7407-5, p. 550 František Palacký: Archiv český