Muriel FitzRoy, 1st Viscountess Daventry (8 August 1869 - 8 July 1962) was a British aristocrat and the wife of Edward FitzRoy, who was Speaker of the House of Commons from 1928 until his death in 1943.
Lady Daventry was born Muriel Douglas-Pennant, elder daughter of Lt Col Hon Archibald Charles Henry Douglas-Pennant, second son of Edward Douglas-Pennant, 1st Baron Penrhyn.
On 6 May 1943, just over two months after the death of her husband, she was created Viscountess Daventry, of Daventry in the County of Northampton, a viscountcy being the customary retirement honour for Speakers. To date, she was the last peeress to be granted an hereditary peerage.
Edward Fitzroy and Lady Daventry had four children:
| Escutcheon: | Quarterly 1st & 4th per bend sinister Ermine and Ermines a lion rampant Or a canton sable for distinction (Pennant), 2nd & 3rd grand quarters quarterly 1st & 4th Argent a man’s heart Gules ensigned with an Imperial crown Proper on a chief Azure three mullets of the field 2nd & 3rd Argent three piles Gules on the two outer ones a mullet of the field (Douglas) [1] |