Pothinus

Pothinus or Potheinos (; early 1st century BC – 48 or 47 BC), a eunuch, was regent for Pharaoh Ptolemy XIII Theos Philopator of the Ptolemaic Kingdom. He is most remembered for turning Ptolemy against his sister and co-ruler Cleopatra, thus starting a civil war, and for having Pompey decapitated and presenting the severed head to Julius Caesar according to some sources.

When Ptolemy XII died in 51 BC, his will stated that Ptolemy XIII and Cleopatra VII were to become co-rulers of Egypt, with the Roman Republic as their guardians. Ptolemy XIII was underage and Pothinus was appointed as his regent. The general Achillas and the rhetorician Theodotus of Chios were also guardians of the Egyptian king. When Ptolemy and Cleopatra were elevated to the status of senior rulers, Pothinus was maintained as the former's regent. Most Egyptologists believed that Pothinus used his influence to turn Ptolemy against Cleopatra. In the spring of 48 BC, Ptolemy, under Pothinus' guidance, attempted to depose Cleopatra in order to become sole ruler while Pothinus planned to act as the power behind the throne. They gained control of Alexandria, then the capital of Egypt, and forced Cleopatra out of the city. She soon organized her own army and a civil war began in Egypt, while Arsinoe IV also began to claim the throne for herself.