Catherine Sedley, Countess of Dorchester
- Also including Sedley's daughter, Lady Catherine Darnley
Catherine Sedley, Countess of Dorchester, Countess of Portmore (21 December 1657 – 26 October 1717), daughter of Sir Charles Sedley, 5th Baronet, was the mistress of King James II and VII both before and after he came to the thrones.  Catherine was not noted for beauty but for her wittiness and sharp tongue.
Catherine was the only legitimate child of Restoration hellrake and poet Sir Charles Sedley. Her mother was Lady Catherine Savage, daughter of John Savage, 2nd Earl Rivers. She grew up "notoriously plain." While her father roistered around England, her mother spiraled into insanity until she entered a psychiatric hospital in Ghent in Catherine's early teens. At this low point in her life, Sir Charles consoled his daughter by introducing a common-law wife, Anne Ayscough, into the family and ejecting Catherine from the house.
She worked for Italian princess Mary of Modena, who had just married James, Duke of York, heir to the British throne. This eventually led to an affair with him. She was bewildered at having been chosen by James."It cannot be my beauty for he must see I have none," she remarked incredulously. "And it cannot be my wit, for he has not enough to know that I have any." James in fact was often attracted to women who were generally considered plain, if not ugly; his brother Charles II once joked that his confessor must impose these mistresses on him as a penance.
After his accession James yielded to pressure from his confessor Fr. Bonaventure Giffard, backed by Robert Spencer, 2nd Earl of Sunderland and several Catholic councillors to put her away for a time. While James by his own account took Giffard's intervention "very kindly, he being a truly religious man" he told his councillors sharply "not to meddle in things that in no way related to them."
She was created Countess of Dorchester for life in 1686, an elevation which aroused much indignation and compelled Catherine to reside for a time in Ireland. In 1696 she married Sir David Colyear, Bt., who was created Earl of Portmore in 1703, and she was thus the mother of Charles Colyear, 2nd Earl of Portmore. After the Glorious Revolution when Queen Mary II refused to receive her at Court, Catherine inquired how Mary, who had broken the commandment to honour her father was in any way better than Catherine who had broken the commandment against adultery.
At the court of George I she met Louise de Kérouaille, Duchess of Portsmouth and William III's mistress Elizabeth Hamilton, Countess of Orkney and exclaimed "God! Who would have thought that we three whores should meet here." At George's coronation, when the Archbishop of Canterbury, Thomas Tenison, ritually asked if the people accepted their new King, Catherine, observing the number of soldiers on duty, asked caustically " Does the old fool think that anyone will say No"?
By James II, Lady Dorchester had a daughter Lady Catherine Darnley (died 1743), who married James Annesley, 3rd Earl of Anglesey, and after his death married John Sheffield, 1st Duke of Buckingham and Normanby. Through Catherine Darnely she was the ancestress of the Barons Mulgrave and of the Mitford sisters. Through her son, Charles, Lord Portmore, she was the grandmother of Elizabeth Collier, wife of Dr Erasmus Darwin, the physician, scientist, poet and grandfather of Charles Darwin..
|Ancestors of Catherine Sedley, Countess of Dorchester|
- Holloway, Susan Scott (2010). The Countess and the King: A Novel of the Countess of Dorchester and King James II. NAL Trade. ISBN 0-451231155.
- Prioleau, Betsy (2004).Seductress: Women Who Ravished the World and Their Lost Art of Love
- "Catherine Sedley, Countess of Dorchester (1657-1717), Mistress of James II". National Portrait Gallery.
- Pearson, Karl (2011). The Life, Letters and Labours of Francis Galton. Cambridge University Press. p. 19. ISBN 978-1108072403.
- Prioleau, Betsy (2004). Seductress: Women Who Ravished the World and Their Lost Art of Love. Catherine Sedley, 1657-1717: Penguin (Non-Classics). ISBN 0143034227.
- Herman, Eleanor (2005). Sex with Kings: 500 Years of Adultery, Power, Rivalry, and Revenge. Enchanting Ugliness: William Morrow. p. 52. ISBN 0060585439.
- Herman, Eleanor (2005).Sex With Kings p. 218
- The Edinburgh Magazine, vol 9 p. 447
- Thorne, James (2011). Handbook to the environs of London, alphabetically arranged, containing an account of every town and village, and of all places of interest, within a circle of twenty miles round London. University of Toronto Libraries. p. 692.