Question: Who is the paternal grandfather of Jacob Pleydell-Bouverie, 4Th Earl Of Radnor?
Answer: Jacob Pleydell-Bouverie, 2nd Earl of Radnor

Successive Earls of Radnor were governors of the hospital from the eighteenth century to 2015. William Pleydell-Bouverie, 3rd Earl of Radnor (11 May 1779 – 9 April 1869), styled Viscount Folkestone until 1828, was the son of Jacob Pleydell-Bouverie, 2nd Earl of Radnor and Hon. Anne Duncombe