Constantius was the middle of the three sons Constantine had with Fausta.  Of the three he was the one that showed the most promise.

Those who occasionally mention the education or talents of

Constantius, allow that he excelled in the gymnastic arts of leaping and

running that he was a dexterous archer, a skilful horseman, and a master

of all the different weapons used in the service either of the cavalry

or of the infantry.