[1] After having carried out studies of philosophy and letters, Eugène completed in 1920 the diplomatic examination with distinction.

He was sent to Bucharest, Paris, Madrid, London and Washington, D.C. Eugène married Philippine de Noailles on 28 February 1917.

During the invasion of Belgium by the Germans in 1940, Eugène joined (near Antwerp) the motorized group at the vanguard.

When Belgium was demobilized, he and his wife worked to provision the country and transformed the castle of Belœil into a hiding place for hundreds of Jewish children escaping the Holocaust, for which he and his wife received the honor of Righteous Among the Nations.

[2] After the Second World War, he was named ambassador of Belgium to India (1947 to 1951),[3] then to Spain (1951 to 1958).