Sir John Lethbridge, 1st Baronet

• Burke, Bernard, Sir. A genealogical and heraldic dictionary of the peerage and baronetage of the British Empire. London : Harrison 1869. page 685

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In 2010 he was discovered to be the father of Claire Clairmont; her mother had created the idea of a "Charles Clairmont," to disguise the illegitimacy of her two children. (He was not the father of her other child.)

https://en.wikipedia.org/wiki/Claire_Clairmont

https://en.wikipedia.org/wiki/Lethbridge_baronets

From WIkipedia: Sir John Lethbridge, 1st Baronet (1746-1815), of Whitehall Place, Westminster; Sandhill Park, Somerset; Westaway in the parish of Pilton, Devon, and Winkleigh Court, Winkleigh,[2] Devon, was Member of Parliament for Minehead in Somerset from 1806-7. He served as Sheriff of Somerset in 1788-9. In 2010 he was discovered to have been the natural father of Claire Clairmont,[3] and thus the grandfather of Lord Byron's daughter Allegra.

Origins

He was born on 12 March 1746, the only son of John I Lethbridge (d.1761)[4][5] of Westaway House in the parish of Pilton, North Devon, by his wife Grace Cardor (alias Carder), daughter of Amos Cardor of Westdown House in Devon. John I Lethbridge was the only surviving son of Thomas I Lethbridge (1698-1734),[6][7] Gentleman, a lawyer of Clement's Inn, by his wife Sarah Periam, daughter of John I Periam (d.1711)[8] of Milverton, Somerset, and sister of John II Periam (c.1701-1788) of Milverton, MP for Minehead (1742-7).[9] John II Periam in 1720 built a mansion at Sandhill Park in the parish of Bishops Lydeard, Somerset, which descended to the Lethbridge family. Periam was descended from Sir William Peryam (1534-1604) of Little Fulford, near Crediton in Devon, Lord Chief Baron of the Exchequer under Queen Elizabeth I.[10] Thomas I had another son Thomas II Lethbridge (1724-1744), Gentleman, who died aged 20 and was buried in the Bowchier vault in Pilton Church.[11] Thomas I Lethbridge was a younger son of Christopher Lethbridge, Esquire, of Westaway, by his wife Margaret Bowchier (whom he married on 3 January 1681/2[12]), daughter and heiress of Phillip Bowchier (1623-1687) of Westaway. Christopher's uncle was Christopher Lethbridge (died 1670) of Exeter in Devon, Mayor of Exeter in 1660, and one of the Worthies of Devon of the biographer John Prince, (1643–1723). Mayor Christopher Lethbridge appears to have been the ultimate source of the great wealth of the Lethbridge family of Sandhill Park