He was made bishop of Monreale, near Palermo, in 1278, and was there at the time of the Sicilian Vespers (1282). After fleeing Sicily., he was made cardinal-bishop of Frascati on 22 December in 1285, by Honorius IV.
He participated in five papal conclaves, which saw the elections of popes Nicholas IV in 1288, Celestine V in 1294, Boniface VIII in 1294, Benedict XI in 1303 and Clement V in 1305. He became dean of the Sacred College of Cardinals in 1302.
- Boccamiti; John of Tusculum (Tusculum being the same as Frascati), a name also applying to Antipope Benedict X.
- it:Savelli (famiglia)
- Steven Runciman, The Sicilian Vespers.
- The Cardinals of the Holy Roman Church - Consistories of the 13th Century
- CATHOLIC ENCYCLOPEDIA: Hermann of Minden
- Picture (Italian)