Who continued building Alexandria after Alexander the Great left Egypt?

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After Alexander the Great departed Egypt, the development of Alexandria was initially continued by his viceroy, Cleomenes.1

Following Alexander's death in 323 BCE and the subsequent breakup of his empire, control of the city passed to Ptolemy I Soter, who founded the Ptolemaic dynasty. Under the patronage of the Ptolemies, the city grew into a major center of culture, science, and scholarship, serving as the capital of their Egyptian dominion.21