Constans was the youngest son of Constantin I the Great. He was only a boy when his father accorded him the rank of Caesar (emperor-designate). With the death of Constantin I in 337, his three sons Constantin II, Constantius II and Constans adopted the title of Augustus and divided the empire amongst themselves.

In addition to the numismatic collection, there is also a specialist library which is universal in its chronological and geographical scope. It is a reference library only and is open to the public by appointment.

The Byzantine Empire was one of the most significant and powerful states in the Middle Ages. It emerged from the eastern part of the Roman Empire, which was split into two in AD 395. The modern name "Byzantine Empire" is derived from the ancient Greek city of Byzantium. The Byzantines, however, considered themselves Roman. Constantinople, now Istanbul, was the capital of their empire. Its namesake, the Roman emperor Constantine the Great (306-337), refounded the city on the site of Byzantium.

Constans was the youngest son of Constantin I the Great. He was only a boy when his father accorded him the rank of Caesar (emperor-designate). With the death of Constantin I in 337, his three sons Constantin II, Constantius II and Constans adopted the title of Augustus and divided the empire amongst themselves.

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The Macedonian king Alexander the Great is considered to this day to be a great general and conqueror. At the head of his army, he invaded the Persian Empire, the largest and most powerful of its time, which stretched from the eastern coast of the Mediterranean to the Indian subcontinent.