During several generations after the Conquest, a family of the name of Devilstone was in possession of Dilstone, until the time of Henry the Third. The estates then passed to many different owners; the Tynedales, the Crafters, the Claxtons, were successively the masters of the castle; and it was not, according to some accounts,[175] until the tenth year of Queen Elizabeth's reign, that it first owned for its lord one of that unfortunate race to whom it finally belonged, until escheated to the Crown. But certain historians have asserted that, so early as the reign of Henry the Sixth, Dilstone was the seat of Sir Nicholas Radcliffe.[176] At this period, too, other estates were added to those already enjoyed by the Radcliffes. Sir Nicholas married the heiress of Sir John De Derwentwater, to whom had belonged, for several centuries, the manors of Castlerigg and Keswick, and who, since the time of Edward the First, had enjoyed great consideration in the county of Cumberland. This alliance with the Derwentwater family, although it brought to the Radcliffe the possession of a territory, which, for its beauty and value, monarchs might envy, did not for many years, entice them to a removal to the mansion of Castlerigg. That old dwelling-place, a gloomy fortress, among "storm-shaken mountains and howling wildernesses," was far less commodious than the castle at Dilstone, then in great fame from the flourishing monastery which reared its head in the Vale of Hexham. Castlerigg, being, eventually, abandoned by the Radcliffes, went utterly to decay; the materials of the old manor-house are supposed to have been employed in forming a new residence on Lord's Island, in Keswick Lake; and the estate was divided into tenancies, which, in process of time, were infranchised. The ancient demesne of the De Derwentwaters has now passed into the hands of the Trustees of Greenwich Hospital, and the oaks of the park which skirts the lake have of late years supplied much valuable timber.