The collection of pictures at Wilton has been celebrated since the seventeenth century; and its historic arrangement is uniquely well documented in a series of catalogues of which the first, issued in 1731, was the earliest such publication about any private collection in England. Of successive owners of the house, three made significant contributions: William, 4th Earl of Pembroke, who commissioned van Dyck's monumental portrait of his family that dominates the Double Cube Room he had created; his grandson, Thomas, 8th Earl of Pembroke who assembled what was in some respects a pioneering...