Alexander II Zabinas (c. 150 BC – 123 BC) was a Seleucid monarch of the Hellenistic period who reigned as King of Syria between 128 BC and 123 BC. Most historians, ancient and modern, maintain that he was a pretender to the throne, although his coinage suggests that he claimed descent from Antiochus IV (died 164 BC), the brother of King Seleucus IV (died 175 BC). Descendants of both brothers were contending for the throne. In 128 BC, King Demetrius II of Syria, the representative of Seleucus IV's line, invaded Egypt to support his mother-in-law Cleopatra II in a civil war. Demetrius was killed while trying to find refuge in the city of Tyre, and Alexander II became the master of the kingdom. Egypt's Ptolemy VIII did not want a strong king on the Syrian throne, and in 124 BC an alliance was established between Egypt and Cleopatra Thea, ruling jointly with Antiochus VIII, her son by Demetrius II. Alexander II was defeated and was probably executed by Antiochus VIII.