The Commonwealth and Protectorate (1649-1660) refers to the kingless governments of England (including Wales and Cornwall), Scotland, Great Britain and Ireland during the Interregnum between the actual reigns of the Stuart King Charles I (1625-1649) and his son King Charles II (1660-1685).
See
and
under the Lords Protectors, first Oliver Cromwell (1653-1658) and then his son Richard Cromwell (1658-1659)
References
Commonwealth and Protectorate Wikipedia(Text) CC BY-SA