the Week of Proper 20 / Ordinary 25
The Catholic Encyclopedia
The period of fifty days before Easter. It begins with the Sunday before Ash Wednesday, called Dominica in Quinquagesima or Esto Mihi from the beginning of the Introit of the Mass; it is a Sunday of the second class, and the colour the Mass and Office is violet.
For many early Christians it was the beginning of the fast before Easter, hence called, as with the Syrians, Dom. ingressus jejunii. For some, Quinquagesima marked the time after which meat was forbidden and was therefore called Dom. carnis privium, ad carnes tollendas, carnevala; by the Poles, Ned. zapustna. Since these regulations affected mainly the clergy, we find the name carnis privium sacerdotum and in Germany herren fastnacht. Where abstinence from meat began earlier, this Sunday introduced the time in which neither milk nor eggs etc, (ova et lacticinia) were allowed, hence called by the Greeks Dom. cesei comestrix et ovorum; Melchites, sublationis ovorum et casei; Austrians, Käse- or Milchfaschingsonntag, Sonntag in der Butterwoche; Italians, de'latticini; and Serbians, bele poklade (white meats). The Slavs name it Ned. III. predpepelnicna, i.e. the third Sunday before Ash Wednesday; Bohemians, Ned. II po devitniku, i.e. the second Sunday after the ninth before Easter. In many places this Sunday after and the next two days were used to prepare for Lent by a good confession; hence in England we find the names Shrove Sunday and Shrovetide.
As the days before Lent were frequently spent in merry-making, Benedict XIV by the Constitution "Inter Cetera" (1 Jan., 1748) introduced a kind of Forty Hours' Devotion to keep the faithful from dangerous amusements and to make some reparation for sins committed.
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Obstat, Nihil. Lafort, Remy, Censor. Entry for 'Quinquagesima'. The Catholic Encyclopedia. https://www.studylight.org/​encyclopedias/​eng/​tce/​q/quinquagesima.html. Robert Appleton Company. New York. 1914.