Feast of the Circumcision of Christ to be celebrated simply as the octave day of Christmas, the "eighth day" on which, according to , the child was circumcised and given the name Jesus. In the 13th or 14th century 1 January began to be celebrated in Rome, as already in Spain and Gaul, as the feast of the Circumcision of the Lord and the Octave of the Nativity, while still oriented towards Mary and Christmas. The emphasis that Saint Bernardine of Siena (1380–1444) laid on the name of Jesus in his preaching led in 1721 to the institution of a separate Feast of the Holy Name
Revised Julian calendar grace, presumably including its acceptance of the new calendar. The basic justification for the new calendar is the known errors of the Julian calendar, which will in the course of time lead to a situation in which those following the Julian calendar will be reckoning the month of December (and the feast of Christ's Nativity) during the heat of summer, August and its feasts during the deep cold of winter, Easter during the autumn season, and the November feasts in the springtime. This would conflict with the Church's historic practice of celebrating Christ's birth on , a date chosen for