Felsted School is an English co-educational day and boarding independent school, situated in Felsted, England. It is in the British Public School tradition, and was founded in 1564 by Richard Rich, 1st Baron Rich (also known as Riche) who, as Lord Chancellor and Chancellor of the Court of Augmentations, acquired considerable wealth from the spoils of the Dissolution of the Monasteries including the nearby Leez Priory, which he enlarged and made his own home. The school became a notable educational centre for Puritan families in the 17th century, numbering a hundred or more pupils, under Martin Holbeach, Headmaster from 1627–1649, and his successors (see below). John Wallis and Isaac Barrow were educated at Felsted in this period, as were four of Oliver Cromwell's sons.