Who conquered the Persian Empire and what did it accomplish?

Answer 1

Alexander the great. After his death it was divided up amongst his generals into the Hellenistic Kingdoms (Macedonia, Egypt, Syria etc).

These kingdoms, apart from fighting amongst each other, introduced a veneer of Greek civilisation in northeast Africa, eastern Europe and the Middle East for a few hundred years.

Answer 2

The Persian Empire was conquered by Alexander the Great of Macedonia in 330 BC. This conquest accomplished the end of Persian rule in the region and ushered in the Hellenistic period, which saw the spread of Greek culture and influence throughout the conquered territories. Alexander's conquests also laid the foundation for the later expansion of the Roman Empire.