The story of Barlaam and Ioasaph, by "John the Monk." Traditionally ascribed to St. John Damascene, but possibly actually the work of St. Euthymius the Georgian.

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Barlaam and Josaphat are the main characters of a seventh-century Christian legend. Barlaam, a hermit, converted the prince Josaphat to Christianity, despite the efforts of Josaphat's father Abenner to prevent such a thing. Although Barlaam and Josaphat are included in the Roman Martyrology and in the Greek calendar, the story is actually a Christianized version of a legend about Buddha.

Short article on the mythical saints Barlaam and Josaphat (or Joasaph). There are also real Christian saints of both names, not connected to this legend.

An essay on the legend of Barlaam and Ioasaph (or Yudasaf) by Norman Hugh Redington. Immensely popular in the Middle Ages, this story was translated into European, Middle Eastern, and African languages; and "the True Faith was variously identified as Christianity, Islam, Judaism, and Manichaeism."