From London to Land's End and Two Letters from the "Journey through England by a Gentleman". Defoe Daniel

      With her was buried at the same time her Grace’s daughter the Marchioness of Caermarthen (being married to the Marquis of Caermarthen, son and heir-apparent to the Lord of Leeds), who died for grief at the loss of the duchess her mother, and was buried with her; also her second son, the Duke Percy Somerset, who died a few months before, and had been buried in the Abbey church of Westminster, but was ordered to be removed and laid here with the ancestors of his house. And I hear his Grace designs to have a yet more magnificent monument erected in this cathedral for them, just by the other which is there already.

      How the Dukes of Somerset came to quit this church for their burying-place, and be laid in Westminster Abbey, that I know not; but it is certain that the present Duke has chosen to have his family laid here with their ancestors, and to that end has caused the corpse of his son, the Lord Percy, as above, and one of his daughters, who had been buried in the Abbey, to be removed and brought down to this vault, which lies in that they call the Virgin Mary’s Chapel, behind the altar. There is, as above, a noble monument for a late Duke and Duchess of Somerset in the place already, with their portraits at full-length, their heads lying upon cushions, the whole perfectly well wrought in fine polished Italian marble, and their sons kneeling by them. Those I suppose to be the father of the great Duke of Somerset, uncle to King Edward IV.; but after this the family lay in Westminster Abbey, where there is also a fine monument for that very duke who was beheaded by Edward VI., and who was the great patron of the Reformation.