Cynthia Mary Brooke, Viscountess Brookeborough, DBE (née Sergison; 10 May 1897 – 2 March 1970), was a British peeress and the first wife of Basil Stanlake Brooke, 1st Viscount Brookeborough, Prime Minister of Northern Ireland from 1943 to 1963.
[1] Cynthia was born in Cuckfield, Sussex, to Captain Charles Warden Sergison and Florence Emma Louise Hanbury-Tracy, daughter of Charles Hanbury-Tracy, 4th Baron Sudeley.
The future Lord and Lady Brookeborough had three sons, two of whom were killed in action during the Second World War.
In the 1959 Birthday Honours, she was invested as a Dame Commander of the Order of the British Empire (DBE), for public services in Northern Ireland.
After her death, Lord Brookeborough married Sarah Eileen Bell, daughter of Henry Healey, of Belfast, and widow of Cecil Armstrong Calvert, former director of neurosurgery at the Royal Victoria Hospital, Belfast.