"Rounheads" was the nickname given to the Puritan supporters of Parliament during the English Civil Wars. Roundhead political and religious factions included (but were not limited to) Presbyterians, classical republicans, Levellers, and Independents. Today, Roundheads are most associated with Oliver Cromwell, who rose to prominence as an MP and Parliamentary soldier, and eventually imposed unity on the various Parliamentary factions by establishing himself as Lord Protector in 1653. The Roundheads' enemies, the Royalist supporters of King Charles I, were nicknamed Cavaliers.