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Ptolemy IX Soter

2nd/1st century BC king of Ptolemaic Egypt

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Background and early life

When the Ptolemaic king Ptolemy V died in 180 BC, he left three children: Ptolemy VI, Cleopatra II, and Ptolemy VIII. All three ruled together from 169 BC until 164 BC, when Ptolemy VIII expelled his brother from power. In 163 BC, he was expelled in turn and forced to withdraw to Cyrene. However, when Ptolemy VI died in 145 BC, Ptolemy VIII was invited back to Egypt to serve as king, marrying his sister Cleopatra II, also sister and widow of Ptolemy VI. The relationship between Ptolemy VIII and Cleopatra II rapidly deteriorated, especially when Ptolemy VIII took Cleopatra III, daughter of Ptolemy VI and Cleopatra II, as a second wife. The conflict eventually led to a civil war with Cleopatra II on one side and Ptolemy VIII and Cleopatra III on the other (132–126 BC). Ptolemy VIII and Cleopatra III were victorious, but reconciled with Cleopatra II and restored her as co-regent in 124 BC.

Ptolemy IX was the son of Ptolemy VIII and Cleopatra III. The exact date of his birth is a bit unclear. As pharaoh, his Horus name was "Distinguished through his birth together with the living Apis; twin in his birthplace with the son of Isis" which seems to indicate that he was born in the same year as an Apis bull, i.e. 143/142 BC. This would put his birth two years before his parents' marriage, which took place in 141 BC. Some historians, like Günther Hölbl, consider this insuperable and propose to place his birth in 140 or 139 BC instead.

Initially, Ptolemy IX was not the heir to the throne – that was Ptolemy Memphites, the son of Ptolemy VI and Cleopatra II, who was roughly the same age as him. In 134/133 BC, Ptolemy IX served as the annual priest of Alexander the Great, the year after Ptolemy Memphites had done the same. However, in 130 BC, during the civil war, Cleopatra II attempted to have Ptolemy Memphites crowned as her co-ruler, so Ptolemy VIII had him murdered, leaving Ptolemy IX as the heir.

Around 117 BC, Ptolemy IX was sent to Cyprus, reportedly at his mother's request, where he served as governor of the island (strategos, nauarchos, archiereus, archikynegos). Shortly before this he had married his sister Cleopatra IV, who probably gave birth to two sons while the couple was on Cyprus: the future Ptolemy XII in 117 BC and Ptolemy, future king of Cyprus, c. 116 BC.

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