 The subsequent mission of Saint Patrick established churches in conjunction with "civitates" like his own in Armagh; small enclosures in which groups of Christians, often of both sexes and including the married, lived together, served in various roles and ministered to the local population.Patrick set up diocesan structures with a hierarchy of bishops, priests, and deacons.During the late 5th and 6th centuries true monasteries became the most important centres