Final answer:
After Charles I died, Oliver Cromwell was appointed as a temporary monarch. Cromwell was the former general of the parliamentary forces.
Step-by-step explanation:
After the execution of Charles I, the executive power decided to appoint Oliver Cromwell as a temporary monarch. Cromwell was the former general of the parliamentary forces. He led the Puritans and their allies in Parliament to victory in the English Civil War and eventually became the Lord Protector of England.