Another and perhaps a better way of presenting to a modern reader the overwhelming economic power of the mediæval monastic system, especially its economic power in the Valley of the Thames, would be to add to such a list of houses a map of that valley showing the manors in ecclesiastical hands, the freeholds and leaseholds held by the great abbeys, in addition to the livings that were within their gift; in a word, a map giving all their different forms of revenue. Such a map would show the Valley of the Thames and its tributaries covered with ecclesiastical influence upon every side. Even if we confined ourselves to the parishes upon the actual banks of the river, the map would present a continuous stretch of possessions upon either side from far above Eynsham down to below bridges. The research that would be necessary for the establishment of such a complete list would require a leisure which is not at the disposal of the present writer, but it is possible to give some conception of what the monastic holdings were by drawing up a list confined to but a small part of these holdings and showing therefore _a fortiori_ what the total must have been. In this list I concern myself only with the eight largest houses in the whole length of the river. I do not mention parishes from which the revenues were not important (though these were numerous, for the abbeys held a large number of small parcels of land). I do not mention the very numerous holdings close to the river but not actually upon it (such as Burnham or Watereaton), nor, which is most important of all, do I count even in the riparian holdings such foundations as were not themselves set upon the banks of the Thames. Whatever Thames land paid rent to a monastery not actually situated upon the banks of the river, I omit. Finally the list, curtailed as it is by all these limitations, concerns only the land held at the moment of the Dissolution. Scores of holdings, such as those of Lechlade, which was dissolved in Catholic times, Windsor, which was exchanged as we have seen at the time of the Conquest, I omit and confine myself only to the lands held at the time of the Dissolution.