That group gained prominence due to an early victory at Marston Moor.
This man's Scottish campaign saw George Monck sack Dundee as well as a decisive victory despite being besieged by David Leslie in the Battle of Dunbar.  He chaired over the Putney debates, acquired his highest title with the passage of the Instrument of Government, and accepted the provisions laid out under the Humble Petition and Advice. The First (*) Anglo-Dutch war came to an end during his rule, and the Self Denying Ordinance barred members of Parliament from leading a group headed by this man. That group gained prominence due to an early victory at Marston Moor. His most notable victory came at the head of his New Model Army against forces led by Prince Rupert of the Rhine at the Battle of Naseby. For 10 points, identify this man who ruled as the Lord Protector of England after the death of Charles I.
This man's Scottish campaign saw George Monck sack Dundee as well as a decisive victory despite being besieged by David Leslie in the Battle of Dunbar.  
Oliver {Cromwell}