noun

• (uncountable) The study of saints and the documentation of their lives.
  "The second half of the eleventh century saw a notable surge of interest in hagiography throughout England, which meant that many of the Anglo-Saxon saints of earlier eras were furnished, often for the first time, with a Latin Vita."
• (countable) A biography of a saint.
• (countable, by extension) A biography which expresses reverence and respect for its subject.
  "Churchill revisionism, of course, is almost as much of a cottage industry as Churchill hagiography."
• (derogatory) A biography which is uncritically supportive of its subject, often including embellishments or propaganda.
  "For an obsequious hagiography of [William] Byrd, see L. Wright 1940. For a more critical assessment, see Lockridge 1987, 1992."