August 1 was Lammas Day, formerly a British harvest festival and “quarter day” in Scotland. The celebrations were tied to the wheat harvest, and peasants were expected to give their landlords a quantity of grain. (In more recent times, Scottish tenants paid landlords their quarterly rent that day.) According to Wikipedia, the ancient Anglo-Saxons would take loafs of bread to church to have them blessed and then break them in four pieces, putting a piece in each corner of the barn.
Praise the Lord