Sarah Seymour, Duchess of Somerset born Sarah Alston was an English heiress and benefactor. She married three times including to the Duke of Somerset. She died childless leaving sundry generous legacies. She established Tottenham Grammar School and created the almshouses in Froxfield. She has a memorial in Westminster Abbey.

Tottenham Grammar School (TGS) was a grammar school in North London, with local football connections. Its history goes back beyond the 1631 bequest by the Duchess of Somerset. It closed in 1988, but it created the Tottenham Grammar School Foundation.