His letter of recommendation was signed by eighteen notable academicians, including Ion Nistor, Alexandru Lapedatu, Dimitrie Pompeiu, Gheorghe Spacu, Emil Racoviţă, Iorgu Iordan, Constantin Ion Parhon, Nicolae Bănescu, Constantin Rădulescu-Motru, Ştefan Ciobanu, Radu R. Rosetti, and Silviu Dragomir.
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As the Romanian consul general in Berlin (1931-1941) and the director of the consular department of the Romanian Foreign Ministry (15 June 1941–17 October 1944), “in both functions, during one and a half decades, Karadja developed an intense activity in order to save Romanian Jews surprised by the war in the kingdom of death”.
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He is a descendant of a very aristocratic family having Byzantine roots in Constantinople as well as among rulers of Wallachia in the 18th and 19th century.
Constantin Stanislavski | Carl Constantin Platen | Constantin Wilhelm Lambert Gloger | Constantin Argetoianu | Vacheron Constantin | Constantin C. Giurescu | Constantin Cantacuzino | René Auguste Constantin de Renneville | Johan Albert Constantin Löfgren | Glen Constantin | Georg Abraham Constantin von Arnim | David Constantin | Constantin von Wurzbach | Constantin von Economo | Constantin Stamati-Ciurea | Constantin Sotiropoulos | Constantin Sănătescu | Constantin Rădulescu-Motru | Constantin Popovici | Constantin Niță | Constantin Floros | Constantin Daniel Stahi | Constantin Croitoru | Constantin Costa-Foru | Constantin Coandă | Constantin Carathéodory |