Another great source of business uncertainties, and therefore of quarrels, was the monopoly of mill and oven. This encouraged not only such tricks as those which are described in Chaucer's Reve's Tale but also disputes as to the length of time during which the peasant was obliged to wait on the miller's good pleasure. Sometimes these regulations were extremely onerous; for instance, in eighteenth century Brittany, the tenants were compelled to grind at their lord's mill “if there were one within 4800 yards; at a water-mill they must wait if necessary for three days and nights, at a windmill one day and night”. But they were generally fairer than this; those of Ramsey abbey in the thirteenth century may be quoted as typical.