The controversial inclusion of Oliver Cromwell in the Penguin Monarchs series will doubtless elicit a few tuts of disapproval from royalists. What is Cromwell doing – as David Horspool concedes, “even in square brackets” – in a list of kings and queens that runs from Athelstan to Elizabeth II? Monarchy is, however, a slippery concept and not to be crudely equated with kingly titles or the blue blood that Cromwell conspicuously lacked. Strictly speaking, Horspool reminds pedants, monarchy means a sole ruler, not necessarily the holder of a royal title. Today, the Trump presidency more closely approximates to monarchical rule than the highly circumscribed position of the British Queen.
Really interesting read about Cromwell in FULL, here: