A vicar is a representative, deputy or substitute; anyone acting "in the person of" or agent for a superior. Linguistically, vicar is cognate with the English prefix "vice", similarly meaning "deputy". It also refers to a senior priest in the Church of England. The title appears in a number of Christian ecclesiastical contexts, but also as an administrative title, or title modifier, in the Roman Empire. In addition, in the Holy Roman Empire, a local representative of the emperor, such as an archduke, could be styled "vicar".
St John's Vicarage, Penzance, Cornwall
Ordinary (church officer)
An ordinary is an officer of a church or civic authority who by reason of office has ordinary power to execute laws.
Pope Pius XI, depicted in this window at Cathedral of Our Lady of Peace, Honolulu, was ordinary of the universal Church as well as the Diocese of Rome from 1922 to 1939. At the same time, Bishop Stephen Alencastre, Apostolic Vicar of the Sandwich Islands, was the ordinary of what is now the Diocese of Honolulu.