The church of St. John the Forerunner in the district known as Oxeia in Constantinople was the centre of a major healing-cult in the sixth and seventh centuries. Beneath the high altar (MA 24, p. 33, 27), protected from the aisles by railings (27, p. 39, 14) and enclosed in a sarcophagus made of lead placed within a crypt, were laid the relics of St. Artemius (33, p. 50, 20, 36, 30-37, 1). On the right of the altar was the chapel of St. Febronia (22, p. 29, 11, 24, p. 33, 26-7 etc.). This martyr also featured prominently in the cult as she appears to have been a kind of assistant or stand-in for Artemius 24, p. 34, 27). Her assisting role was a very necessary one as it was to her that the saint entrusted the women who came begging to be cured. This is because Artemius was only invoked in Byzantium by those who were suffering from a particular category of afflictions, viz. hernias, varioceles and especially tumours affecting the genitalia. Our knowledge of this extraordinary healing-cult is based mainly on a collection of forty-five short accounts of miraculous cures Apart from about two exceptions, all the accounts of the miraculous cures of Artemius relate to this type of illness which the author describes very simply and unblushingly in a matter-of-fact manner which makes the Miracula an interesting and valuable source to historians of Byzantine medicine.