Cacciavillan entered the
diplomatic service of the
Holy See in 1959. He served as secretary of the
nunciature to the Philippines (1960–1964), of the
nunciature to Spain (1964–1968), and of the
nunciature to Portugal (1968). He received his
episcopal consecration on 21 February from Cardinal
Jean-Marie Villot, with Archbishop
Duraisamy Simon Lourdusamy and Bishop Carlo Fanton serving as
co-consecrators, at
St. Peter's Basilica. He selected as his episcopal
motto:
"In Virtute Dei". While nuncio to Kenya, Cacciavillan also served as
Permanent Observer to the
United Nations Environment Programme and the
United Nations Human Settlements Programme. and the first Pro-Nuncio to
Nepal on 30 April 1985. On 13 June 1990, he was named to succeed Archbishop
Pio Laghi as
Pro-Nuncio to the United States and
Permanent Observer of the Holy See to the Organization of American States. He also served as the Holy See's representative to the World Association of Jurists. He was instrumental in the promotion of McCarrick to the see of Washington in 1999 over O'Connor's objections. In a letter to Cardinal Re, who had asked him for advice on McCarrick at the request of Pope John Paul II, Cacciavillan argued that no enquiry should be made into these letters' claims because "Nothing new would be learned, and worse, a 'trial situation' could be created against Msgr. McCarrick, leaving the impression of great concern, which would have the effect of receiving answers in harmony with the expressed concern, rather than a de-dramatization, whereas a de-dramatization might perhaps be justified." ==Curia career==