So this first full week of Lent is also an Ember Week!
But, er, what does that mean?
Originally, there were only three Ember Seasons: around Pentecost; in September; in December. They arose (I still suspect) out of the old pagan Roman celebrations of harvests: respectively, of the harvests of the Corn, the Wine, and the Oil. There were special Masses on the Wednesdays, the Fridays, and the Saturdays within these three weeks.
But unlike more recent harvest celebrations, they were decidedly sober occasions. The Community fasted!
The fast appears to have led to the association of Ordinations with the Ember Weeks, since it is appropriate to approach the Sacrament of Holy Order with prayer and self-denial and even exorcism. The actual Ordinations would be done during an all-night vigil between Saturday and Sunday. The minor Orders, followed by the Major Orders, were conferred one after another in the gaps within the series of Readings.
So how does it come about that we have an Ember week at this time of the year? How did Tria Tempora mutate into Quattuor Tempora? ["Three Seasons" into "Four Seasons".] After all, February and March, in our Northern hemisphere, are not months one would immediately associate with Harvest!
To be concluded. I have tried to find a path through data mainly given by the great Anglican liturgist, student and admirer of the Classical Roman Rite, Fr G G Willis [Essays in Early Roman Liturgy, 1964]. And I have made a few connections of my own.. I do not find Talley convincing.