Katherine Villiers, Duchess of Buckingham

The Most Honourable
The Marchioness of Antrim
The Most Honourable The Marchioness of Antrim
	Katherine, then Duchess of Buckingham, with her son George, 1628 (detail of larger portrait).
Personal details
Born	Lady Katherine Manners; 1603; Belvoir Castle, Leicestershire, England
Died	1649 (aged 45–46) ; Waterford, Ireland
Spouses	George Villiers, 1st Duke of Buckingham; Randal MacDonnell, 1st Marquess of Antrim;
Children	Mary Stewart, Duchess of Richmond; Charles Villiers, Earl of Coventry; George Villiers, 2nd Duke of Buckingham; Francis Villiers, 1629–1648;
Parents	Francis Manners, 6th Earl of Rutland; Frances Knyvet;

Preview warning: Page using Template:Infobox officeholder with deprecated parameter "honorific-suffix". Replace with "honorific_suffix".

Preview warning: Page using Template:Infobox officeholder with deprecated parameter "honorific-prefix". Replace with "honorific_prefix".

Katherine MacDonnell, Marchioness of Antrim, 18th Baroness de Ros of Helmsley (née Manners; died 1649), better known by her first marriage as Katherine, Duchess of Buckingham, was an English aristocrat. The daughter and heiress of Francis Manners, 6th Earl of Rutland, she was known as the richest woman in Britain outside of the royal family. She married first George Villiers, 1st Duke of Buckingham, the favourite, and possibly lover, of King James I of England; and secondly, she married the Irish peer Randal MacDonnell, 1st Marquess of Antrim.