The Hellenistic period is part of the Ancient world, not to the Middle Ages.

You musn't dare to question the fact that the great university of Alexandria in Egypt was founded during the Hellenistic Period.

Aristotle thrived during the Hellenistic Period.

Alexander the Great went all "Conquering Hero" on the Persians during the Hellenistic Period.

The Hellenistic period was the period between the conquests of Alexander the Great to the conquest of Egypt, the last Hellenistic state which fell to the Romans,

The Hellenistic Age began at the end of the Classical Period 323 BCE. It was marked by the death of Alexander the Great.

The Hellenistic Period begins with the death of Alexander.