A royal peculiar is a Church of England parish or church exempt from the jurisdiction of the diocese and the province in which it lies, and subject to the direct jurisdiction of the monarch.
Westminster Abbey
A dean, in an ecclesiastical context, is a cleric holding certain positions of authority within a religious hierarchy. The title is used mainly in the Catholic Church, the Anglican Communion, and many Lutheran denominations. A dean's assistant is called a sub-dean.
Portrait of Dutch Deacon Jacobus Johannes Graaf (1839–1924)