Furno was born in
Bairo,
Piedmont, in 1921. He was educated at the diocesan College at Ivrea and later at the Seminary of Ivrea, where he studied philosophy and theology. He was sent to the Theological Faculty, Crocetto Salesian Athenaeum in
Turin, (1948–1949) and later the
Pontifical Roman Seminary, Rome where he took a
doctorate in utroque iure, both canon and civil law, (1953). Furno was summoned to the elite
Pontifical Ecclesiastical Academy, Rome from 1951 to 1953 where he took practical courses in diplomacy. After his priestly ordination on 25 June 1944 and six years of pastoral work in his home diocese, he began a career in the diplomatic service of the
Holy See. He worked in a subordinate role in Colombia, Ecuador and
Jerusalem, and then in the
Secretariat of State. Following these assignments and episcopal consecration on 16 September 1973, ==Cardinal==