page_title: John Cassian
section_title: Veneration
hierarchical_section_title: John Cassian / Veneration
caption_attribution_description: Français&#160;: l'fr:Abbaye de Saint-Victor de Marseille en fr:1818. Lithographie de C. de Last (25 × 35 cm) Bibliothèque des Amis de Saint-Victor
context_page_description: John Cassian, also known as John the Ascetic and John Cassian the Roman, was a Christian monk and theologian celebrated in both the Western and Eastern churches for his mystical writings. Cassian is noted for his role in bringing the ideas and practices of Christian monasticism to the early medieval West.
context_section_description: He is a saint of the Eastern Orthodox Churches, with a feast day on 29 February, a date assigned also in the liturgical calendar of the Episcopal Church (USA). Because this day occurs only once every four years on leap years, official church calendars often transfer his feast to another date (usually 28 February).
  The Roman Catholic Church also ranks him as a saint, with a feast day on 23 July. Like his contemporaries Augustine of Hippo and John Chrysostom, he was never formally canonized, a process that came into use several centuries after his death. Pope Urban V referred to him as sanctus (a saint) and he was included in the Gallican Martyrology He is included also in the Roman Martyrology with a feast-day on 23 July.  In the Irish church, at the beginning of the ninth century, Cassian was commemorated on 25 November, as indicated in the Martyrology of Óengus: "Lasin nEoin Cassian assa érchain corann" (With John Cassian whose crown is very fair).  Like the great majority of recognized saints of the church, he is not one of the saints in the General Roman Calendar, but the Archdiocese of Marseilles and some monastic orders celebrate his memorial on his feast day.
  Cassian's relics are kept in an underground chapel in the Monastery of Saint Victor in Marseilles. His head and right hand are in the main church there.
caption: Abbey of Saint Victor, Marseille, where his relics are placed
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