Rise of the Parthian Empire

Timeline

1. -247Parthia · IranArsaces (Arsaces I), leader of a Parthian nomadic tribe, took advantage of the Seleucid Empire's wars of the Diadochi and internal strife to rise in Parthia and declare independence, founding the Arsacid dynasty—the beginning of the Parthian Empire.
2. -238–-141Iranian Plateau · IranSuccessive Arsacid kings gradually consolidated the Parthian heartland; Mithridates I (r. ca. 171–138 BCE) pushed far westward, seizing Mesopotamia and invading the Seleucid core, making Parthia a great power of West Asia.
3. -53Carrhae · MesopotamiaParthia defeated the Roman legions under Crassus at the Battle of Carrhae, establishing dominance over Mesopotamia and demonstrating the advantage of its horse-archery tactics; the Parthian–Roman confrontation thus entered a long stalemate.