Parliamentarian
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( n.) One who adhered to the Parliament, in opposition to King Charles I.
(2): ( n.) One versed in the rules and usages of Parliament or similar deliberative assemblies; as, an accomplished parliamentarian.
(3): ( a.) Of or pertaining to Parliament.
The Nuttall Encyclopedia [2]
One who, in the English Civil War, supported the cause of the Parliament against the king.