I recently discovered that members of my family served as oirchinnigh, or, "hereditary custodians" for the parish of Donagh in Monaghan county. That is until the Maguires displaced us from our lands in the 13th century AD. Oirchinnigh were important in collecting church revenue and using it to realize upkeep and improvements of the property and buildings thereon.

Here is an excerpt from "Erenagh" on wikipedia:

"The medieval Irish office of Erenagh was responsible for receiving parish revenue from tithes and rents, building and maintaining church property and overseeing the termon lands that generated parish income. Thus he had a prebendary role. The Erenagh had the tonsure but took no other holy orders; he had a voice in the Chapter when they consulted about revenues, paid a yearly rent to the Bishop and a fine on the marriage of each daughter. The role usually passed down from generation to generation in certain families in each parish. After the Reformation and the dissolution of the monasteries the role of erenagh became subsumed in the responsibilities of the parson in each parish."

The article goes on to discuss the surname McInerney (derived from erenagh).