Ottokar Theobald Otto Maria
Czernin von und zu Chernin, http://www.geocities.com/veldes1/czernin.html states"Ottokar's older brother Theobald Josef Ottokar Otto Maria, was an imperial and royal chamberlain, and married Ottokar's wife's sister, Maria Anna Kinsky von Wchinitz und Tettau." He triggered the "Sixtus" affair. He became ambassador to Roumania in October 1912, just as the Balkan Wars broke out. Following Roumania's declaration of war on Austria-Hungary, Czernin returned to Vienna and was later appointed by recently coronated Kaiser Karl to succeed Istv‚an Buri‚an as Foreign Minister. Czernin published his book, "In dem Weltkrieg," in 1919.