According to the site run by the National Library of Wales, the Dictionary of Welsh Biography Online (and supported by y-DNA lines)
Our Richard Lewis is NOT Richard Lewis of the Van, son of Catherine Sackville. Here is the quote concerning our non-ancestor Richard Lewis, "The uncle, RICHARD LEWIS ( 1623 - 1706 ), purchased the manor of Corsham and was buried there. He certainly neglected and possibly dismantled Van . He d. 7 Oct. 1706. "
The author of this information was Henry John Randall, F.S.A., (1877-1964), Bridgend. His source citation was this: G. T. Clark , Limbus patrum Morganiæ et Glamorganiæ being the genealogies of the older families of the lordships of Morgan and Glamorgan , London, 1886 .