Constantine, who became sole Roman emp. 325. Constantine convened the Council of Nicaea* (see also Arianism; Councils and Synods, 4). Beginning in 326 he moved the seat of govt. from Rome to Byzantium, which he rebuilt and 330 renamed Constantinople. One tradition says he was bap. by Sylvester I (see Popes, 1) at the Lateran*; another account has him bap. at or near Nicomedia by Eusebius* of Nicomedia; M. Chemnitz,* Examen, Part IV, Locus II, Section IV, Chap. I, near the end, speaks of the