The bridle had to go through many innovations, (changes), to become what it was today. The bit was made out of bone in the 8-14 centuries. Now it is made out of sturdy metal. Reins are made out of leather, but back then they were made out of rope. Many pieces were added to the bridle. The bridle was a simple artifact used for horses, now it is a little more complex with its pieces. Including the throat latch that was added with the chin strap and crown piece.