Was Oliver Cromwell was a leader of the Puritans during the Commonwealth period?

Yes, Oliver Cromwell was a prominent leader of the Puritans during the Commonwealth period in England. He played a key role in the English Civil War, leading the Parliamentarian forces against the Royalists. After the execution of King Charles I in 1649, Cromwell became the Lord Protector of the Commonwealth, governing England from 1653 until his death in 1658. His leadership was characterized by a strong Puritan moral code and a focus on establishing a republican form of government.