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How long did the Ptolemaic dynasty founded by Ptolemy I Soter rule Egypt?
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Ptolemy I Soter
Ptolemy I Soter, portrait on a silver tetradrachm; in the British Museum
The Ptolemaic dynasty, founded by Ptolemy I Soter, ruled Egypt for 275 years.
Ptolemy I Soter officially assumed the kingship of Egypt on November 7, 305 BCE. The dynasty continued to rule until the death of Cleopatra VII on August 12, 30 BCE, at which point the kingdom fell under Roman dominion. This reign was the longest of any dynasty established within the former empire of Alexander the Great.123