Who succeeded Oliver Cromwell as dictator but was later deposed?

Richard Cromwell succeeded his father, Oliver Cromwell, as Lord Protector of England, Scotland, and Ireland after Oliver's death in 1658. Unlike his father, Richard lacked the political acumen and the military support necessary to maintain control over the government, leading to significant challenges during his leadership. Eventually, he was unable to manage the tensions between different factions in England and, facing pressure from the army and parliament, he resigned in 1659. This resignation marked the end of his rule and the subsequent restoration of the monarchy under Charles II.

Richard Cromwell's tenure was short-lived, lasting just about nine months, and his inability to assert effective leadership in the political environment following Cromwell's death directly led to his deposition. In contrast, figures like Charles II were completely separate from the interim leadership of Richard and were involved in the later restoration of the monarchy, making Richard the most accurate answer in this context.