Minister

A person known in politics as Minister is described by thefreedictionary.com as a:


 * 1) A high officer of state appointed to head an executive or administrative department of government.
 * 2) An authorized diplomatic representative of a government, usually ranking next below an ambassador.
 * 3) A person serving as an agent for another by carrying out specified orders or functions.

Source- http://www.thefreedictionary.com/minister