The Decree of Gratian (about 1150) mentions forty-one feasts besides the diocesan patronal celebrations; the Decretals of Gregory IX (about 1233) mention forty-five public feasts and Holy Days, which means eighty-five days when no work could be done and ninety-five days when no court sessions could be held. In many provinces eight days after Easter, in some also the week after Pentecost (or at least four days), had the sabbath rest. From the thirteenth to the eighteenth century there were dioceses in which the Holy Days and Sundays amounted to over one hundred, not counting the feasts of particular monasteries and churches. In the Byzantine empire there were sixty-six entire Holy Days (Constitution of Manuel Comnenus, in 1166), exclusive of Sundays, and twenty-seven half Holy Days. In the fifteenth century, Gerson, Nicolas de Clémanges and others protested against the multiplication of feasts, as an oppression of the poor, and proximate occasions of excesses. The long needed reduction of feast days was made by Urban VIII (Universa per orbem, 13 Sept., 1642). There remained thirty-six feasts or eighty-five days free from labour. Pope Urban limited the right of the bishops to establish new Holy Days; this right is now not abrogated, but antiquated. A reduction for Spain by Benedict XIII (1727) retained only seventeen feasts; and on the nineteen abrogated Holy Days only the hearing of Mass was obligatory. This reduction was extended (1748) to Sicily. For Austria (1745) the number had been reduced to fifteen full Holy Days; but since the hearing of Mass on the abrogated feasts, or half Holy Days, the fast on the vigils of the Apostles were poorly observed, Clement XIV ordered that sixteen full feasts should be observed; he did away with the half Holy Days, which however continued to be observed in the rural districts (peasant Holy Days, Bauernfeiertage). The parish priests have to say Mass for the people on all the abrogated feasts. The same reduction was introduced into Bavaria in 1775, and into Spain in 1791; finally Pius VI extended this provision to other countries and provinces.