In 13th century England, many feudal lords held regular markets. The Hundred Rolls of 1279, which covered Oxfordshire, Huntingdonshire and South Cambridgeshire, shows how the multiplication of markets influenced the labour and money rents of the villeins. In the Midlands, a highly manorialized region, some large "classic manors", such as Witney, Yaxley and Alwalton, were the sites for markets held by great ecclesiastical lords. In these manors, as in most manors of this region, rigid virgate systems were maintained and the villeins bore heavy labour rents. These markets were probably used for the shipment of demesne products. In Watlington and Holm, markets were held by the Earl of Cornwall. These manors lay in woodland areas, where the process of manorialization was far from complete. They acquired great sums of money by selling their products in the local markets. In other manors, where "primary markets" existed, for example Bampton, Charlbury and Gamlingay, the virgate system did not exist. The villeins' rents were very light and were paid mainly in money. These markets promoted the liberalization of the villeins. But even at these markets, the lords took the profits, such as rents for the stall and pitches, tolls on goods bought or sold, and dues for the use of standard measures. And from the burgages, they collected substantial rental fees. In the 13th century, the lords could benefit from holding markets. The feudal society was compatible with the market economy of both the lords and the peasants.