William, Governor of Virginia
William Ironside's History and Antiquities of Twickenham, published in 1797 but written much earlier.
in a footnote dated 1785: "On opening this vault about a year ago for the interment of (Adm. the Hon. John Biron) one of the family the body of Sir William Berkeley was found lying on the ground, without a coffin, cased in lead exactly fitted to the shape of the body, shewing the form of the features, hands, feet, and even nails; and appears to be beat firmly to it. and looks like a figure in armour."