Definition of Artabanus iv

Artabanus IV of Parthia ruled the Parthian Empire from 216 to 224. He was the younger son of Vologases V of Parthia (191–208) who died in 208. Artabanus IV rebelled against his brother  Vologases VI of Parthia (208–228), and soon gained the upper hand, although Vologases VI maintained himself in a part of  Babylonia until about 228.