The English Civil War's Parliamentarians were commonly referred to as "Roundheads".
The English Civil War -LRB- 1642 -- 1651 -RRB- was a series of armed conflicts and political machinations between Parliamentarians -LRB- `` Roundheads '' -RRB- and Royalists -LRB- `` Cavaliers '' -RRB- over , principally , the manner of England 's government .
