John Mauropous, an eleventh-century Metropolitan of Euchaïta, has long been commemorated in the service books of the Orthodox Church. The Synaxarion for the Office of Orthros on 30th January, the day dedicated to the Three Fathers, St. Basil the Great, St. Gregory the Theologian, and St. John Chrysostom, tells how the festival was instituted by Mauropous and describes him as ‘the well-known John, a man of great repute and well-versed in the learning of the Hellenes, as his writings show, and moreover one who has attained to the highest virtue’. In western Europe something was known of him certainly as early as the end of the sixteenth century; his iambic poems were published for the first time by an Englishman in 1610, and his ‘Vita S. Dorothei’ in the Acta Sanctorum in 1695. But it was not until the second half of the nineteenth century that scholars were really able to form some idea of the character and achievement of this Metropolitan of Euchaïta. Particularly important were two publications: Sathas' edition in 1876 of Michael Psellus' oration on John, and Paul de Lagarde's edition in 1882 of some of John's own writings. This last contained not only the works already printed, but a number of hitherto unpublished sermons and letters, together with the constitution of the Faculty of Law in the University of Constantinople, and a short introduction containing part of an etymological poem. But there remained, and still remains, one significant omission: John's canons have been almost consistently neglected.