tetrarch

Strong’s Dictionary of Greek Words:

Greek:
τετράρχης
Transliteration:
tetrarches
Phonic:
tet-rar’-khace
Meaning:
from 5064 and 757; the ruler of a fourth part of a country ("tetrarch")
KJV Usage:
tetrarch

Jackson’s Dictionary of Scripture Proper Names:

ruler of a fourth part (of a country)