It is uncertain, however, what role Sylvester hade - if any - in the negotiations regarding the Donatists at Arles, or over Arianism at the first Ecumenical Council of Nicea in 325. According to some, he did not even have the opportunity to intervene. What is certain is that his faith so moved his contemporaries, that they publicly honored him as “confessor”, i.e. one who, though not suffering martyrdom, lived a life completely given to Christ. Pope St. Sylvester also contributed to the development of the liturgy. It was most probably during his reign that the first Roman Martyrology was composed, and his name is associated with the creation of the ancient Roman school of sacred song.
Pope St. Sylvester is patron of the chivalric order called the Militia Aurata, or “of the Golden Spur”, which, as tradition would have it, was founded by Emperor Constantine I in person. After various events throughout the centuries, in 1841, Pope Gregory XVI, in the framework of a vast reform of the equestrian orders, separated the Order of Pope St. Sylvester from the Militia Aurata, assigning to the Order of St. Sylvester particular statutes and decorations. In 1905, Pope St. Pius X made further amendments, which are still in force. The Order includes four classes: Knight/Dame, Knight/Dame Commander, Knight/Dame Commander with Star (Grand Officer), Knight/Dame Grand Cross.