This man's criticism of the Earl of Manchester's lackluster motivation led 
This man's criticism of the Earl of Manchester's lackluster motivation led to the passage of the Self-Denying Ordinance, which prevented members of Parliament from holding military posts. Since a debate at Putney proved inconclusive, this man had Levellers executed after several mutinies. This man was second-in-command to Thomas (*) Fairfax in the New Model Army, which represented the Roundhead side and won against the Cavaliers at the Battle of Naseby. He became head of the Barebones Parliament after the execution of Charles I. For ten points, identify this man who became Lord Protector after winning the English Civil War.
This man's criticism of the Earl of Manchester's lackluster motivation led to the passage of the Self-Denying Ordinance, which prevented members of Parliament from holding military posts.
Oliver Cromwell