Oliver Cromwell portrait

 oliver cromwell, english leader, english civil war, parliament army, puritan, lord protector, monarchy abolition, royalists, roundheads, battle of naseby, commonwealth, political power, military commander, british history, seventeenth century, king charles execution, republican rule, protestant belief, political reform, dictatorship, army leadership, civil conflict, england politics, historical figure, governance, revolution, military campaign, political authority, british monarchy, historical period, state control, leadership role, religious influence, national conflict, regime change, power struggle, english republic, military strategy, political upheaval, constitutional change