Henry III granted the nuns of Catesby a weekly market every Monday within their manor of Catesby and a yearly fair for three days in the same place; and almost any monastic chartulary will provide other instances of such rights[293]. The majority of the special perquisites which have been described would originate in special grants from the Crown; but it must be remembered that every manorial lord could count on certain perquisites _ex officio_, for which no specific grant was required. For his manor provided him with more than agricultural produce on the one hand and rents and farms on the other. Through the manor court he also received certain payments due to him from all free and unfree tenants, in particular those connected with the transfer of land, the heriot and the fines already mentioned. From unfree tenants he could also claim various other dues, the mark of their status; merchet, when their daughters married off the estate, leyrwite, when they enjoyed themselves without the intermediary of that important ceremony, a fine when they wished to send their sons to school and a number of other customary payments, exacted at the manor court and varying slightly from manor to manor. Moreover the tolls from the water- or wind-mill at which villeins had to grind their corn all went to swell the purse of the lord[294]. This is not the place for a detailed description of manorial rights, which can be studied in any text-book of economic history[295]; a word must, however, be said about the mortuary system, which did not a little to enrich the medieval church. When a peasant died the lord of the manor had often the right to claim his best animal or garment as a mortuary or heriot, and by degrees there grew up a similar claim to his second best possession on the part of the parish priest. "It was presumed," says Mr Coulton, "that the dead man must have failed to some extent in due payment of tithes during his lifetime and that a gift of his second best possession to the Church would therefore be most salutary to his soul"[296].