Prefect

Prefect (from the Latin praefectus, substantive adjectival form of praeficere: "put in front", meaning in charge) is a magisterial title of varying definition, but essentially refers to the leader of an administrative area.

A prefect's office, department, or area of control is called a prefecture, but in various post-Roman Empire cases there is a prefect without a prefecture or vice versa. The words "prefect" and "prefecture" are also used, more or less conventionally, to render analogous words in other languages, especially Romance languages.

Ancient Rome

Praefectus was the formal title of many, fairly low to high-ranking officials in ancient Rome, whose authority was not embodied in their person (as it was with elected Magistrates) but conferred by delegation from a higher authority. They did have some authority in their prefecture such as controlling prisons and in civil administration.

Feudal times

Especially in Medieval Latin, præfectus was used to refer to various officers—administrative, military, judicial, etc.—usually alongside a more precise term in the vernacular (such as Burggraf, which literally means Count of the Castle in the German language).

Ecclesiastical

The term is used by the Catholic Church, which based much of its canon law terminology on Roman law, in several different ways.

The Roman Curia has the nine Prefects for the Congregations as well as the two of the Papal Household and of the Economic Affairs of the Holy See.

The title also attaches to the heads of some Pontifical Council (central departments of the Curia), who are principally titled president, but in addition there is sometimes an additional ex officio position as a prefect. For example, the president of the Pontifical Council for Interreligious Dialogue is also the prefect of the Commission for Religious Relations with Muslims.