Dorothy Savile, Viscountess Halifax was the first wife of George Savile, 1st Viscount Halifax, and the mother of the 2nd Marquess.
Lady Dorothy, Marchioness of Halifax, by Jan van der Vaart
Dorothy Spencer, Countess of Sunderland, was the wife of Henry Spencer, 1st Earl of Sunderland, and the daughter of Robert Sidney, 2nd Earl of Leicester, and Lady Dorothy Percy.
Dorothy Savile, Viscountess Halifax
…later 1st Marquess of Halifax), and the mother of the 2nd Marquess. Dorothy was the daughter of Henry Spencer, 1st Earl of Sunderland, and his wife, the former Lady Dorothy Sidney (or Sydney). Lady Dorothy married George Savile on 29 December 1656, at St Giles in the Fields in London. They had two children…
Portrait of Dorothy, Countess of Sunderland (Anthony van Dyck)