Answer
Cleopatra Thea, along with her brother Ptolemy VIII, formed an alliance against Demetrius II's successor, Zabinas, in 124 BCE, during the Seleucid civil war. By uniting their forces, Cleopatra Thea and Ptolemy VIII sought to secure their respective claims to the Seleucid throne and counter Zabinas' power in the region. This alliance marked a strategic shift in the conflict and set the stage for significant developments in the Seleucid kingdom.