Was the bill of rights written at the same time as the constitution

On September 25, 1789, Congress transmitted to the state Legislatures twelve proposed amendments to the Constitution. Numbers three through twelve were adopted by the states to become the United States (U. S.) Bill of Rights, effective December 15, 1791. James Madison proposed the U. S. Bill of Rights.

Not it was not The bill of rights was more like the ground work for the constitution