Historically, there had been a debate about when quartodecimanism disappeared and in particular whether it disappeared before or after the first ecumenical council (Nicaea I) in 325. According to Mark DelCogliano, "the older opinion persists" but Duchesne's opinion "has gained widespread acceptance." According to DelCogliano, "by the early 4th century all Christians were celebrating Easter on a Sunday. Accordingly, it was not the Quartodeciman practice that Constantine sought to eliminate, but rather the so-called 'Protopaschite' practice which calculated the paschal full moon according to the Jewish lunar calendar and not the Julian solar calendar".