Background
Giannini was born in Nettuno, Italy, and ordained a priest on 15 June 1946.
Giannini was born in Nettuno, Italy, and ordained a priest on 15 June 1946.
He was named appointed auxiliary bishop to the Diocese of Rome on 1 December 1980, as well as Titular Bishop of Subaugusta and ordained bishop on 6 January 1981. Giannini retired as an auxiliary bishop of Rome on 3 July 1998, and died in 2012, aged 88.