Cromwell and the English Republic
Parliament fought the king, won, and cut off his head — the first time in Europe a reigning monarch was tried and executed by his own subjects rather than quietly murdered. The republic that followed could not govern: Oliver Cromwell dismissed the parliaments that had made him, took the title Lord Protector, ruled with major-generals, and was offered the crown he had fought to abolish. He refused it. He died, his son proved useless, and within two years England invited the dead king's son back. A revolution against one-man rule produced one-man rule, and then restored the thing it had killed.
Prolonged chaos creates demand for order; a single figure concentrates power by promising to supply it.