The word for today is…
bailiwick (noun):
1 law enforcement : the office or jurisdiction of a bailiff
2: the sphere in which one has superior knowledge or authority : a special domain
Source : Merriam -Webster
Etymology : The first half of the word bailiwick comes from the Middle English word for “bailiff”—in this case, a term referring to a sheriff or chief officer of a town in medieval England. Bailiff comes, via Anglo-French, from the Medieval Latin verb bajulare, meaning “to care for” or “to support.” The second half of bailiwick comes from wik, a Middle English word for “dwelling place” or “village,” which ultimately hails from the Latin word vicus, meaning “village.” (This root is also thought to have given English -wich and -wick, suffixes used in place names like Norwich and Warwick.) Although bailiwick dates from the 15th century, the “special domain of knowledge” sense we use most often today did not appear in English until the middle of the 19th century.
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