Ptolemy IX Lathyros

Ptolemy IX Lathyros, also known as Ptolemy Soter II, ruled Egypt across an interrupted tenure between 116 BC and 81 BC, with dates uncertain by about a year. He was the son of Ptolemy VIII Physcon and Cleopatra III. His early reign was dominated by his mother, who eventually forced him into exile on Cyprus in favour of his younger brother, Ptolemy X Alexander I.

Ptolemy IX returned to the Egyptian throne in 88 BC following the expulsion and death of his brother. During his second reign, he worked to restore royal control following internal rebellions in Upper Egypt. He ruled his final months alongside his daughter, Berenice III. In Alexandria and throughout the Nile valley, his administration attempted to project traditional pharaonic authority despite severe economic strains and mounting Roman diplomatic interference.

Ptolemy IX was an active patron of traditional Egyptian temples. He oversaw the completion of the great entrance pylon at the Temple of Horus at Edfu and constructed a monumental pylon at Medinet Habu in western Thebes. His reign is well documented by hieroglyphic temple inscriptions, Greek and demotic papyri, and classical historians. His tomb in Alexandria has not been found.

Monuments

• Edfu Temple pylon completion
• Medinet Habu pylon

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