Bailiff's area of authority.

a territory administered by a bailiff

the administrative unit of the English Province of the Templars,comprising a region, shire or group of villages

The area of responsibility for a sheriff, responsible for keeping the peace and for enforcing the royal laws.

a branch of knowledge; "in what discipline is his doctorate?"; "teachers should be well trained in their subject"; "anthropology is the study of human beings"

jurisdiction.