When did the Hellenistic Age begin and end?

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The Hellenistic Age is historically defined as the period beginning with the death of Alexander the Great in 323 BCE and concluding with the conquest of Egypt by Rome in 30 BCE.123

While this timeframe marks the core historical period, some scholars extend the era for an additional three and a half centuries, ending in 330 CE when Constantine the Great moved the capital of the Roman Empire to Constantinople.14