1) Earl 2) Lord 3) Peer 4) Robert 
[consultant] A parliamentarian is an expert on parliamentary procedure who advises organizations and deliberative assemblies. This sense of the term `parliamentarian` is distinct from the usage of the same term to mean a member of Parliament. Some parliamentarians are officers or employees of the deliberative assembly that they serve, as in...
• (n.) One who adhered to the Parliament, in opposition to King Charles I. • (a.) Of or pertaining to Parliament. • (n.) One versed in the rules and usages of Parliament or similar deliberative assemblies; as, an accomplished parliamentarian.
Par`lia·men·ta'ri·an adjective Of or pertaining to Parliament. Wood. 
parliamentarian One versed and skilful in parliamentary usages and tactics; a skilled and experienced parliamentary debater.
noun an expert in parliamentary rules and procedures