Seleucid Empire - Civil War and Further Decay

Civil War and Further Decay

After the death of Antiochus IV Epiphanes, the Seleucid Empire became increasingly unstable. Frequent civil wars made central authority tenuous at best. Epiphanes' young son, Antiochus V Eupator, was first overthrown by Seleucus IV's son, Demetrius I Soter in 161 BC. Demetrius I attempted to restore Seleucid power in Judea particularly, but was overthrown in 150 BC by Alexander Balas — an impostor who (with Egyptian backing) claimed to be the son of Epiphanes. Alexander Balas reigned until 145 BC, when he was overthrown by Demetrius I's son, Demetrius II Nicator. Demetrius II proved unable to control the whole of the kingdom, however. While he ruled Babylonia and eastern Syria from Damascus, the remnants of Balas' supporters — first supporting Balas' son Antiochus VI, then the usurping general Diodotus Tryphon — held out in Antioch.

Meanwhile, the decay of the Empire's territorial possessions continued apace. By 143 BC, the Jews in form of the Maccabees had fully established their independence. Parthian expansion continued as well. In 139 BC, Demetrius II was defeated in battle by the Parthians and was captured. By this time, the entire Iranian Plateau had been lost to Parthian control.

Demetrius Nicator's brother, Antiochus VII Sidetes, took the throne after his brother's capture. He faced the titanic chore of restoring a rapidly crumbling empire; one facing threats on multiple fronts. Hard-won control of Coele-Syria was threatened by the Jewish Maccabee rebels. Once-vassal dynasties in Armenia, Cappadocia, and Pontus were threatening Syria and northern Mesopotamia; the nomadic Parthians, brilliantly led by Mithridates I of Parthia had overrun uppland Media (home of the famed Nisean horse herd); and Roman intervention was an ever-present threat. Sidetes managed to bring the Maccabees to heel; frighten the Anatolian dynasts into a temporary submission; and then, in 133, turned east with the full might of the Royal Army (supported by a body of Jews under the Maccabee prince, John Hyrcanus) to drive back the Parthians.

Sidetes' campaign initially met with spectacular success, recapturing Mesopotamia, Babylonia and Media; defeating and slaying the Parthian Satrap of Seleucia-on-Tigris in personal combat. In the winter of 130/129 BC, his army was scattered in winter quarters throughout Media and Persis when the Parthian king, Phraates II, counter-attacked. Moving to intercept the Parthians with only the troops at his immediate disposal, he was ambushed and killed. Antiochus Sidetes is sometimes called the last great Seleucid king.

After the death of Antiochus VII Sidetes, all of the recovered eastern territories were recaptured by the Parthians. The Maccabees again rebelled, civil war soon tore the empire to pieces, and the Armenians began to encroach on Syria from the north.