Unfortunately for the development of parts of the southern and southeastern portion of the county, the purchase of these great tracts by Lee, Carter and others greatly delayed their settlement and this to the disadvantage of the owners as well as the neighborhood. Even Lord Fairfax is found setting off to himself large specific tracts.[15] It was their intention to create hereditary landed estates, modelled on those existing in England and to be farmed by a numerous class of yeoman tenantry. But as the very type of farmer-settler most desired as tenants by the great owners came in, they early and strongly evinced that determination, common to all in the Colonies, to hold their land in a freehold that could be passed on indefinitely to their children and thus insure to them the benefit of their parents' industry and thrift rather than to become tenants for a limited period of any great estate; and this no matter how advantageous or tempting the proffered terms of tenancy. Under then existing conditions, with the supply of new and cheaply purchasable land seemingly inexhaustible if one had but the determination and courage to push on to the newer frontier, they went beyond the great manors, as they came to be called, and seated themselves in the upper lands or crossed the Blue Ridge to the Shenandoah Valley. Eventually and much later, when parts of the manors were sold, it was often in comparatively large parcels and these and the remaining portions were, as a rule, farmed with slave labor, a custom practically nonexistent in the northwest part of the county. Thus the relative thinness of settlement, persisting to this day, of much of the lower lands of Loudoun may be attributed not wholly to the fact that the stronger and more fertile lands lay above Goose Creek but in part to the social history of those early days as well. [15] The well known Leeds Manor in Fauquier was one; named for Leeds Castle, the Fairfax seat in Kent.