Celso Benigno Luigi Costantini was born on 3 April 1876 in
Castions di Zoppola as the second of ten children to Costante Costantini (a building contractor) and Maddalena Altan. His brother Giovanni (1880–1956) became the
Bishop of La Spezia. He followed his father's trade as a
mason and worked since 1887 in that trade before deciding to undergo ecclesial studies. He studied first from 1892 until 1897 at
Portogruaro and then attended as a part-time student at the Academica di San Tommaso in
Rome from 1897 until 1899. It was there that he obtained his
doctorates in
philosophical and
theological studies in 1899. He was
ordained to the
priesthood in Portogruaro on 26 December 1899 and then did
pastoral work until 1914 in
Concordia where he was also elected as
capitular vicar and as a chaplain for the Portogruaro hospital. In Costantini's view, the arts could give expression to God's truth and beauty. In 1911, he founded a Society of Friends of Christian Art. In 1913, he founded
Art Sacra, a scholarly journal focused on
Catholic art history. In 1915 he founded the illustrated journal "Arte Cristiana" and served as its director until 1924. During
World War I he served as a
chaplain in the
Italian Armed Forces since 12 December 1917. He served as the Concordia diocese's
vicar general from 5 November 1918 to 30 April 1920 when he was made
apostolic administrator for
Fiume until a replacement bishop for that diocese could be found. Costantini was also friends with
Agostino Gemelli and over time expressed his support for the convocation of a new ecumenical council though this would not happen until after his death. He also was close with
Alcide De Gasperi and the two housed together at some stage in 1944. ==China==