[1] Giulio Masi was born in Arezzo, Italy in 1570.
[2][3] On 18 May 1611, he was appointed during the papacy of Pope Paul V as Bishop of Giovinazzo.
[1][2] On 23 May 1611, he was consecrated bishop by Roberto Francesco Romolo Bellarmino, Cardinal-Priest of San Matteo in Merulana, with Attilio Amalteo, Titular Archbishop of Athenae, and Antonio d'Aquino, Bishop of Sarno, serving as co-consecrators.
[2] On 18 July 1627, he was appointed during the papacy of Pope Urban VIII as Bishop of Monopoli.
[2] He served as Bishop of Monopoli until his death in 1636.