In a recent work on English Catholic recusants the author describes ‘a small wave of conversions to Catholicism’ drawn from a wide spectrum of English Protestantism that began late in the reign of Charles II and increased in size after the accession of James II. One of the groups mentioned was a number of High Church Anglicans. My intention is to study one member of this group, the clergyman Mordaunt Webster whose career was centered primarily in the ‘enthusiastically Protestant region of East Anglia.’ Born in the village of Aldwinckle St. Peter, Northants, in 1637, he was the son of John Webster, rector of the local church, who during the Civil War served with the Royalist army and was ejected by Parliament from his Northamptonshire living and from another in Rutland.