St. Sylvester, the son of a lawyer, had himself studied law at Bologna before becoming a canon of Osimo, his native town. He was a zealous and fervent priest. His determination to retire into solitude was caused by the sight of the decomposing corpse of a friend. He at first lived as a hermit at Grotta Fucile, and then on Monte Fano where followers came to join him. He gave them the habit and Rule of St. Benedict together with certain other customs which reflect his own aspirations and the devotional tendencies of his day. He died in 1267 at the age of ninety.