Two thousand five hundred years after construction, during the Roman occupation, the site was adapted as an amphitheatre for the use of the citizens of the nearby Roman town of Durnovaria (Dorchester). The entrance was retained and an inner enclosure built in the south west interpreted as being for the use of the performers. The inside of the henge was lowered, with the material produced piled onto the banks.
During the Civil War the site was again reused as an artillery fort guarding the southern approach to Dorchester. The site as it exists today is a product of the remodelling during this era - the most significant modification was the large ramp opposite the entrance.
Its amphitheatre role was briefly revived in the late 1600s and early 1700s, as a place of public execution. In 1685, at the close of the Monmouth Rebellion, Judge Jeffreys ordered eighty of the rebels to be executed here. In 1705 Mary Channing, a nineteen year old woman found guilty of poisoning her husband, was executed by strangulation and burning at the Rings. Thomas Hardy used this event in his poem The Mock Wife, and recorded some details of his research into the event in his personal writings.
The monument is now a public open space, and used for open-air concerts, festivals and re-enactments.