Was Cromwell the first British dictator?

Was Oliver Cromwell the first British dictator?

Only arguably during the rule of the Major-Generals, and even then authority was regionally dispersed; Cromwell also repeatedly convened replacement parliaments.

The answer resists applying a simple dictatorship label to Cromwell's entire rule. The strongest case comes during the rule of the Major-Generals, although each governed a different region with considerable latitude, producing something unlike a single centralized dictatorship. Cromwell dissolved the Rump Parliament in 1653, but then summoned Barebone's Parliament and the First Protectorate Parliament rather than abandoning parliamentary government altogether. The exchange separates episodes of military government from a claim that every phase of the Commonwealth operated under the same constitutional arrangement.