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Family and early life
Flood was the younger son of John Flood of Farmley, County Kilkenny, and nephew of Warden Flood, chief justice of the court of king's bench in Ireland, the father of the Right Hon. Henry Flood. He was born in 1741, and was educated at Kilkenny College and at Trinity College, Dublin, where he proceeded B.A. in 1761, M.A. in 1764, LL.B. in 1766, and LL.D. in 1772. He was called to the Irish Bar in 1763, soon attained considerable legal practice, and in the social circles of Dublin was immensely popular from his wit and oddity.
He married twice; firstly Lady Juliana Annesley, the daughter of Richard Annesley, 6th Earl of Anglesey and secondly Frances, the daughter of Sir Henry Cavendish, 1st Baronet of Doveridge, with whom he had an only surviving daughter Frances, who married Richard Solly of Walthamstow and York Place, London, whose son Frederick of Ballynaslaney House became Sir Fredericks's heir. 
He sat for Enniscorthy until 1783. From 1783 to 1790 he was M.P. for Ardfert, and in 1796–7 for Carlow Borough. His relationship to Henry Flood did more for his reputation then his own abilities, and he consistently followed in his cousin's footsteps. In 1778 he was made a King's Counsel and was elected a bencher of the King's Inns. He was the Custos Rotulorum of Wexford. On 3 June 1780 he was created a baronet of Ireland ‘of Newton Ormonde, co. Kilkenny, and Banna Lodge, co. Wexford.’ Two years later he married Lady Juliana Annesley, daughter of Arthur Annesley, 5th Earl of Anglesey, and he took a prominent part in the volunteer movement, being elected colonel of the Wexford regiment.
In many debates which preceded the abolition of the Irish parliament Flood was a frequent speaker. Sir Jonah Barrington calls him an ostentatious blunderer, whose ‘bulls’ did not contain the pith of sound sense which underlay the mistakes of Sir Boyle Roche. He adds that Flood would rashly accept any suggestions made to him while speaking, and one day, just after he had declared ‘that the magistrates of Wexford deserved the thanks of the lord-lieutenant,’ he added, on some wit's suggestion, ‘and should be whipped at the cart's tail’. He steadily opposed the Act of Union, but when that measure was carried he did not retire from politics, but sat in the united House of Commons for County Wexford from 1812 to 1818. He made no particular impression there.
His only son died unmarried in 1800, and it was proposed to perpetuate Flood's title by creating him a baronet of the United Kingdom, with remainder to his only daughter Frances, who was married to Richard Solly, esq. He died on 1 February 1824, before the patent for this new honour had passed the great seal, and left his estates to his grandson, Frederick, who took the name of Flood in addition to his own.
- Burke, Bernard (1912). Genealogical and heraldic history of the landed gentry of Ireland.
- (Barrington, Personal Sketches, i. 111).
- Hansard 1803–2005: contributions in Parliament by Sir Frederick Flood
|Parliament of Ireland|
|Member of Parliament for Enniscorthy
With: Mountifort Longfield
William Alexander English
|Member of Parliament for Ardfert
With: John Scott (1783)
John Tydd (1783–1790)
John Ormsby Vandeleur
|Member of Parliament for Carlow Borough
With: John Ormsby Vandeleur
|Parliament of the United Kingdom|
William Congreve Alcock
|Member of Parliament for County Wexford
With: Robert Carew
|Baronetage of Ireland|
(of Newton Ormond)