After the war Count Czernin was accused of arranging the execution of 43 Italian fascist servicemen of the Legione Tagliamento during the night of 27/28 April 1945 (Rovetta massacre).
On 18 October 1975, in Salzburg, Austria, Phillips married Countess Maria Lucia Czernin von und zu Chudenitz, daughter of Count Paul Otto Ernst Diepold Maria Czernin (1904–1955).