Ptolemy XIII Theos Philopator

Ptolemy XIII Theos Philopator (Greek: Πτολεμαῖος Θεός Φιλοπάτωρ, Ptolemaĩos Theós Philopátōr, lived 62 BC/61 BC–January 13, 47 BC?, reigned from 51 BC) was one of the last members of the Ptolemaic dynasty (305–30 BC) of Egypt.

Son of Pharaoh Ptolemy XII of Egypt (80–58 BC and 55–51 BC), he succeeded his father in the spring of 51 BC as co-ruler of Egypt by his marriage to his older sister Cleopatra VII of Egypt (69–30 BC). In October 50 BC, Ptolemy XIII was promoted to senior ruler along with her, although the eunuch Pothinus acted as regent for him.

In the spring of 48 BC, Ptolemy XIII and Pothinus attempted to depose Cleopatra VII due to her increasing status as Queen. Her face appeared on minted coins, for example, while Ptolemy XIII's name was omitted on official documents. Ptolemy intended to become main ruler, with Pothinus acting as the power behind the throne.

Ptolemy XIII and Pothinus managed to force Cleopatra to flee to Syria, but she soon organized her own army and a civil war began in Egypt. Soon their other sister started to claim the throne as Arsinoe IV of Egypt (r. 48-47 BC), further complicating the situation.

At this point, defeated Roman general Pompey the Great came to Egypt seeking refuge from his pursuing rival Julius Caesar. Initially, Ptolemy XIII pretended to have accepted his request, but on September 29, 48 BC, he had the general murdered in hopes of winning favor with Caesar when the victorious general arrived. Caesar did arrive he was presented with the head of his deceased rival and former ally, but reportedly, instead of being pleased, reacted with disgust and ordered that Pompey's body be located and given a proper Roman funeral. Cleopatra VII proved more successful in winning Caesar's favor and became his lover. Caesar arranged the execution of Pothinus and the official return to the throne of Cleopatra VII, though she had never officially abdicated her marriage to Ptolemy XIII.

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