His grandfather, Iacob Deleu [ro] (1804–1880), fought alongside Avram Iancu in the Revolutions of 1848–1849.

[1] His brother, Ioan Deleu [ro] (1877–1946), participated as representative of Șimleu Silvaniei at the Great National Assembly in Alba Iulia, where the Union of Transylvania with Romania was proclaimed on 1 December 1918.

He continued his high school education in Zalău, Blaj, Brașov, and Beiuș, graduating in 1895.

After military service in the Austro-Hungarian Army in Vienna, he practiced law in Arad from 1903 to 1905.

He served with Gheorghe Pop de Băsești and Iuliu Maniu in the Governing Council of Transylvania during the region's provisional autonomy, until April 1920.