835. The Emperor Louis the Pious introduces the Feast of All Saints into the Frankish Empire.
Between 902 and 920. The first Sunday after Pentecost kept as a Festival of the Holy Trinity in Liège by Bishop Stephen.
993. The first papal canonisation—that of St Ulrich by Pope John XV.
998. Abbot Odilo of Cluny introduces the Commemoratio Omnium Fidelium Defunctorum (2nd Nov.) in his Order.
10th cent. The Festum Conceptionis B.V.M (8th Dec.) appears in several calendars (e.g. the Neapolitan).
1000-1025. Composition of the Menologium Basilianum.
1068-1071. Adoption of the Roman rite in Aragon under King Sancho Ramirez.
1078. Adoption of the Roman rite in Castile.
1080 (circ.). Gregory VII. fixes the number of Sundays in Advent at four, and suppresses deviations from the Roman custom of observing Advent.