The pontificate of Sylvester I dated from Jan 31, 314 to Dec 31, 335 CE (according to the Catalogus Liberianus and, regarding his death in particular, to the Depositio episcoporum and to western martyrologies, while in Byzantine synaxaria it is commemorated on Jan 2). These were a crucial two decades for Roman-Christian history as they coincided with the supremacy of Constantine, who defeated Maxentius in 312 CE and from 324 to 337 CE was the so…