Older coins like the sestertius soon dropped entirely out of use, with many being melted down to create new radiates. By the fourth century AD even these had been discontinued and an entirely new coinage system had been created.
As time passed, older coins like the sestertius became obsolete, with most being melted down to create new coins. By the 4th century AD, even these were no longer in use, paving the way for a brand-new coinage system.