Medieval weekday counting

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In the medieval weekday counting , the days of the week (feriae) designated in Latin were continuously counted with ordinal numbers (prima, secunda, tertia etc.) , with the week starting on Sunday and Monday being the second day (feria secunda) . Sunday and Saturday, due to their Christian-Jewish meaning, were emphasized by the designation as this instead of feria . The exact dating of a weekday took place in this order by referring to the holy days and holidays . For example, for the year 1370, feria tertia ante festum pentecostes refers to May 28th as “Tuesday before Pentecost”.

Sunday (dies) dominica , rarely also feria prima, feria dominica, lux dei
Monday feria secunda
Tuesday feria tertia
Wednesday feria quarta , rarely media septimana
Thursday feria quinta
Friday feria sexta
Saturday This sabbatinus / Sabbati, Sabbatum , rarely also feria septima / Sabbati

Dating in relation to the Roman Catholic holy days and holidays appeared in Western Europe in the 11th century as a mirror of the Pope's growing authority and his universal claim to rule ( investiture controversy , oriental schism , church reforms of the 11th century ) and opposed the previously used ancient Roman names . The Reformation, in turn, ushered in the abandonment of the medieval counting of the weekday, in such a way that the continuous counting of the days of the month in German and Latin ( e.g. vicesima tertia die Junii = June 23) became common in the 16th century in German-speaking countries . This form of calendar was already known in the High Middle Ages, but was only rarely used, for example in the offices of Henry VI. and Frederick II.

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