Rt. Honourable Thomas Penn is the son of William Penn (the founder of the State of Pennsylvania, USA). In 1751 he married Juliana, 4th daughter of Thomas Fermor, 1st Earl of Pomfret. 1760 saw Thomas buy the Stoke Park estate with the Manor house, Stoke Poges. At that time he was already the Lord Proprieter of the province of Pennsylvania. He died in 1775.
Motto: Dum clavum teneam – I shall not give up the helm
Heraldry: Dexter background black. Argent on a fess sable three roundels argent (Penn), impaling, Argent a fess sable between three lions’ head erased gules (Fermor) Crest: A demi-lion rampant argent collared sable the collar charged with three roundels argent. Mantling: Gules and argent