The Bogomils refused to fast on Mondays and Fridays.
Three days' fairs were granted to the abbots in 1129 for the feast of St Peter ad Vincula by Henry for Holy Rood day; in 1282 for Ascension day; and a market on Mondays was obtained in 1282.
All adherents of the sect seem to have kept three Lents in the year, as also to have fasted Mondays, Wednesdays and Fridays of each week; in these fasts a diet of bread and water was usual.
To remedy the loss incurred by this measure Ralph Bloyou in 1331 procured for himself and his heirs a market on Mondays and a fair on the vigil, feast and morrow of St Andrew at Marghasyon.
Fairs known as Tarr fair and Michaelmas fair are now held on the second Mondays in September and October and are chiefly important for the sale of horses and cattle.
The same charter ratified a market on Mondays and provided for another on Saturdays.
The bishop of Salisbury in 1300 received the grant of a weekly market to be held on Mondays: the day was altered to Wednesday by Elizabeth's charter.
Madame Necker entertained the chief leaders of the political, financial and literary worlds of Paris, and her Fridays became as greatly frequented as the Mondays of Madame Geoffrin, or the Tuesdays of Madame Helvetius.