[3] Sebastiano Perissi was born in Boccheggiano, Italy in 1631, but raised in Siena.
[1][2][4] Perissi obtained the degree of Doctor in utroque iure in Siena.
He was Auditor in the nunciature in Florence, and then Vicar General of Naples.
On 9 January 1692, he was appointed during the papacy of Pope Innocent XII as Bishop of Nocera de' Pagani.
[4] On 28 May 1700, he was appointed during the papacy of Pope Innocent XII as Bishop of Grosseto.