One of Edward Tudor’s protectors. When Tom Canty is mistaken for Edward, King Henry VIII and the rest of the palace are convinced that the Prince of Wales has gone mad. St. John and the Earl of Hertford stay close to “Edward” to help him remember how to carry out his duties, what to say, and to remind of his engagements. Lord St. John wonders if Tom’s account of being a beggar and not the real Edward is true, but Hertford shuts him down (although he, too, wonders if Tom’s story is true). When King Henry VIII dies, St. John continues helping Hertford guide Tom through his royal duties and engagements.