What was The period following the death of Oliver Cromwell called?

The period following the death of Oliver Cromwell in 1658 is known as the "Interregnum" or the "Restoration period." This time was marked by political instability and the eventual collapse of the Commonwealth, leading to the monarchy's restoration in 1660 with Charles II ascending to the throne. The Interregnum lasted until the monarchy was reestablished, ending the republican experiment initiated by Cromwell and his predecessors.