A heraldic stone escutcheon sculpted in relief showing his arms survives on the external wall of the parish church of St Giles in the Wood, North Devon, 3 miles north-east of Potheridge, above the private door to the north transept. The arms are as follows:Quarterly of 4: 1st: "Gules, a chevron between three lion's heads erased argent" (Monck); 2nd: quarterly of 4: 1:Royal Arms of England (Arms of King Edward IV); 2 & 3: "Or a cross gules" (de Burgh); 4th: "Barry or and azure, on a chief of the first two pallets between two base esquires of the second over all an inescutcheon argent" (Mortimer); "over-all a baton sinister" (Arms of Arthur Plantagenet, 1st Viscount Lisle (the maternal grandfather of the Duke's grandfather Anthony Monck)) 3rd: "Barry of six argent and azure in chief three torteaux a label of three points for difference" (Grey, Viscount Lisle); 4th: "Gules, a lion rampant within a bordure engrailed or" (Talbot, Viscount Lisle); "the whole circumscribed by the Garter".