http://www.jmu.edu/madison/gpos225-madison2/madprobll.htm
In this text you will find that Madison proposed and drafted -- at the urging of Thomas Jefferson -- 12 amendments later trimmed to 10, that became known as the original "Bill of Rights."
Drink up, horsey.
"At the Constitutional Convention, James Madison had not believed that a bill of rights was required for the new government."
George Mason and the anti federalists set him straight. The reason you are unfamiliar with George Mason is because, unlike Jefferson and Madison, Mason was a devout Christian which doesn't obtain with lefty historical revisionism.
Search Google for "The Father of the Bill of Rights" and then stick your head in the trough and stay under until you can recite the Virginia Bill of Rights which preceded and was precedent for the US Bill of Rights.