The Diocese of llandaff
A Diocese (the name given to the geographical area under the authority of a diocesan bishop) is a complex organisation, and Llandaff is no exception.
Llandaff is subdivided into over 120 parishes (or, more correctly, benefices), and these are grouped together on a formal or informal basis. Each parish will be under the authority of a member of the clergy, who can be a Priest in Charge, Vicar, Rector, or hold another title.
You can find out more about the structure of the Diocese here.