ethnarchy
/ˈɛθnɑːki/Chiefly historical
noun
1Chiefly Ancient History. A territory or province ruled or governed by an ethnarch.
2The office or position of ethnarch; the period of office of an ethnarch.
Origin
Early 17th century; earliest use found in Lodowick Lloyd (fl. 1573–1607). From (i) Middle French ethnarchie.