Gwendolen Mary Fitzalan-Howard, Duchess of Norfolk, 12th Lady Herries of Terregles (née Constable-Maxwell; 11 January 1877 â 28 August 1945) was a British noblewoman and hereditary peer.
Gwendolen Constable-Maxwell was born in 1877, the eldest child of Marmaduke Constable-Maxwell, 11th Lord Herries of Terregles and his wife, Angela (née Fitzalan-Howard).
On 15 February 1904, she married as his second wife her first cousin once removed, Henry Fitzalan-Howard, 15th Duke of Norfolk. The couple had four children:
The 15th Duke of Norfolk died in 1917.
Upon the death of her father in 1908, she, in the absence of sons and as the elder daughter, inherited the Lordship Herries of Terregles and became 12th Lady Herries of Terregles.
She died at her home Kinharvie House near New Abbey in 1945 at the age of 68. A Requiem Mass was said at St Mary's in New Abbey before interment in the Norfolk burial vault at Arundel Castle in Sussex.
Her son Bernard, having succeeded as 16th Duke of Norfolk upon his father's death in 1917, additionally succeeded her as 13th Lord Herries of Terregles.