St. Peter was the last martyr to suffer at Alexandria under the persecution of Diocletian (311) and therefore the Greeks give him the honorable title of “the seal and limit of the persecution.” He was an admirable example of a bishop.
(Source: Fr. Lasance, The New Roman Missal,)
The feast of this holy Abbot of Monte Fano near Fabriano was introduced into the Calendar by Leo XII, who in doing so paid him the honor rendered by the Church to the founders of Religious Orders.
In the Thirteenth Century, when many Benedictine monasteries in Italy had lost much of their former holiness and learning, St. Sylvester succeeded in infusing new vitality into the ancient Order, by founding a monastic family which by the blessing of God transformed several Religious houses, and was distinguished by the sanctity of its members. His Order is called the Silvestrines; it numbered twenty-five houses in Italy when it”s founder died in 1267 at the age of ninety.