Klemens von Metternich
Klemens Wenzel Nepomuk Lothar, Prince von Metternich-Winneburg zu Beilstein, KOGF (; 15 May 1773 – 11 June 1859) was an Austrian diplomat who was at the center of European affairs for four decades as the Austrian Empire's foreign minister from 1809 and Chancellor from 1821 until the liberal Revolutions of 1848 forced his resignation.
Klemens Stefan Sielecki
Klemens Stefan Sielecki (December 8, 1903 in Stanisławów, Austria-Hungary – July 14, 1980 in Kamień Pomorski, Poland) was a Polish engineer and technical director of the first Polish Locomotive Factory Fablok in Chrzanów in the post-war years until 1964.