tetrarch
/ˈtetrɑːk/noun
1- (in the Roman Empire) the governor of one of four divisions of a country or province（古罗马帝国行省或属国的）四分之一地区的长官。
1.1
- one of four joint rulers四个联合统治者之一。
1.2
- archaic a subordinate ruler〈古〉小郡主; 小领主。
派生词
tetrarchy
noun （pl. -ies）词源
Old English， from late Latin tetrarcha, from Latin tetrarches, from Greek tetrarkhēs, from tetra- 'four' + arkhein 'to rule'.