surnamed Soter, 367?–280 b.c., ruler of Egypt 323–285: founder of Macedonian dynasty in Egypt.
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British Dictionary definitions for Ptolemy I
called Ptolemy Soter. ?367–283 bc, king of Egypt (323–285 bc), a general of Alexander the Great, who obtained Egypt on Alexander's death and founded the Ptolemaic dynasty: his capital Alexandria became the centre of Greek culture
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