Alexander I Theopator Euergetes, surnamed Balas (Ancient Greek: Ἀλέξανδρος Βάλας, romanized: Alexandros Balas), was the ruler of the Seleucid Empire from 150 BC to August 145 BC. Picked from obscurity and supported by the neighboring Roman-allied Kingdom of Pergamon, Alexander landed in Phoenicia in 152 BC and started a civil war against Seleucid King Demetrius I Soter. Backed by mercenaries and factions of the Seleucid Empire unhappy with the existing government, he defeated Demetrius and took the crown in 150 BC. He married the princess Cleopatra Thea to seal an alliance with the neighboring Ptolemaic kingdom. His reign saw the steady retreat of the Seleucid Empire's eastern border, with important eastern satrapies such as Media being lost to the nascent Parthian Empire. In 147 BC, Demetrius II Nicator, the young son of Demetrius I, began a campaign to overthrow Balas, and civil war resumed. Alexander's ally, Ptolemaic king Ptolemy VI Philometor, moved troops into Coele-Syria to support Alexander, but then switched sides and threw his support behind Demetrius II. At the Battle of the Oenoparus River in Syria, he was defeated by Ptolemy VI and he died shortly afterward.
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Alexander Balas in the context of Demetrius I Soter
Demetrius I Soter (Ancient Greek: Δημήτριος Α` ὁ Σωτήρ, Dēmḗtrios ho Sōtḗr, "Demetrius the Saviour"; 185 – June 150 BC) reigned as king of the Hellenistic Seleucid Empire from November 162 to June 150 BC. Demetrius grew up in Rome as a hostage, but returned to Greek Syria and overthrew his young cousin Antiochus V Eupator and regent Lysias. Demetrius took control during a turbulent time of the Empire, and spent much of his time fighting off revolts and challenges to his power from threats such as Timarchus and Alexander Balas.
Alexander Balas in the context of Seleucid coinage
The coinage of the Seleucid Empire is based on the coins of Alexander the Great, which in turn were based on Athenian coinage of the Attic weight. Many mints and different issues are defined, with mainly base and silver coinage being in abundance. A large concentration of mints existed in the Seleucid Syria, as the Mediterranean parts of the empire were more reliant on coinage in economic function.
The symbol of Seleucid power was the anchor, which was placed on the obverse of coins depicting Alexander posthumously. Some Seleucid bronze coinage feature decorative serrated edges similarly with certain Roman denarii and rare Macedonian coins.
Alexander Balas in the context of Cleopatra Thea
Cleopatra I or Cleopatra Thea (Koine Greek: Κλεοπάτρα Θεά, which means "Cleopatra the Goddess"; c. 164 – 121 BC), surnamed Eueteria (εὐετηρῐ́ᾱ lit. 'good-harvest/fruitful season') was a ruler of the Hellenistic Seleucid Empire. She was queen consort of Syria from 150 to about 125 BC as the wife of three Kings of Syria: Alexander Balas, Demetrius II Nicator, and Antiochus VII Sidetes. She ruled Syria from 125 BC after the death of Demetrius II Nicator, eventually in co-regency with her son Antiochus VIII Grypus until 121 or 120 BC.
Alexander Balas in the context of Battle of the Oenoparus River
The Battle of the Oenoparus took place in 145 BC on the Oenoparus river (the modern Afrin River, Syria) in the adjoining countryside of Antioch on the Orontes, the capital of the Seleucid Empire. It was fought between a coalition of Ptolemaic Egypt led by Ptolemy VI and Seleucids who favored the royal claim of Demetrius II Nicator against Seleucids who favored the claim of Alexander Balas. Both the Seleucid Empire and the Ptolemaic kingdom were diadochi, Greek-ruled successor states established after the conquests of Alexander the Great.
The Ptolemaic force won the battle, and Balas's hopes of securing the throne were ended. However, King Ptolemy VI suffered a mortal wound in the battle. Despite the Egyptian forces winning the battle, they too would be driven out of Syria by the now unified Seleucid Empire under Demetrius II, which turned on the leaderless Egyptian force and drove them out of Seleucid territory.