John Barthlet or Bartlett (fl. 1566), was an English theological writer. Barthlet was a minister of the Church of England, and held strongly Calvinistic opinions. In 1566 he published a work entitled the Pedegrewe [Pedigree] of Heretiques, wherein is truly and plainely set out the first roote of Heretiques began in the Church since the time and passage of the Gospel, together with an example of the offspring of the same. London, by Henry Denham for Lucas Harryson. On the title-page is an engraving of the bear and ragged staff, and the book is dedicated to the Earl of Leicester, who is described as a "speciall Mecaenas to euery student, and "so fauorable and zelous a friend to the ministrie. Some Latin hexameters and sapphics by graduates of Cambridge, addressed to the reader, preface the v