This section is from the book "A Library Of Wonders And Curiosities Found In Nature And Art, Science And Literature", by I. Platt. Also available from Amazon: A library of wonders and curiosities.
This day is held on the ninth of Janu ary, the Monday after Twelfth-day. The ploughmen, in the north country, draw a plough from door to door, and beg money for drink; from whence this took its name. Plough-day had its origin when the feudal system prevailed in this country, when the lords and barons had their lands tilled by their vassals, or tenants. The Christmas holidays terminated on Twelfth-day, and the ploughing season for the new yeas commenced the first Monday after; on which day, the sock-men (as this sort of ploughmen were then called) were obliged to appear with their ploughs, etc. at a place appointed there, to have them examined, whether they were in a proper condition to perform their lord's work; for ploughs were then scarce, and it was a mark of some consequence to possess one in good order. Hence the appellation of Plough-Monday has ever since being applied to the first Monday after Twelfth-day. It is conjectured, that the system of begging money arose at a time when they could not plough the land on account of its being frozen, as watermen drag about a boat in severe frosts, and beg money, because they are then unable to ply on the river.
 
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