monstraverunt (mon-str<<schwa>>-veer-<<schwa>>nt). [Latin “they have showed”] Hist. A writ of relief for tenants of ancient demesne who were distrained by their lord to do more than the tenure required. — Also termed writ of monstraverunt.
“The little writ serves the turn of a man who claims land according to the custom of the manor; but the tenants of whom we are speaking are protected, and protected collectively, against any increase of their services. This is very plain when the manor is in the hands of a mesne lord. If he attempts to increase the customary services, some of the tenants, acting on behalf of all, will go to the royal chancery and obtain a writ against him. Such a writ begins with the word Monstraverunt. The king addresses the lord: — ‘A, B and C, men of your manor of X, which is of the ancient demesne of the crown of England, have shown us that you exact from them other customs and services than those which they owe, and which their ancestors did in the time when that manor was in the hands of our predecessors, kings of England; therefore we command you to
cease from such exactions, otherwise we shall order our sheriff to interfere.’ ” 1 Frederick Pollock & Frederic W. Maitland, The History of English Law Before the Time of Edward I 388 (2d ed.
[Blacks Law 8th]