The San Marino constitution of 1600. The only thing it has going over ours is its cool cover page (Photo credit: Wikipedia)
Attached below is the whole document for your fun perusal, but chew on this:
Of every country in the world with a written constitution, only San Marino, little San Marino, has a constitution older than ours (theirs goes back to 1600).
Dominican Republic – 32 Constitutions, the most of any country.
Venezuela, that bastion of “liberty” – 26 constitutions.
Ecuador, another bastion of “anti-imperialism” – 20 constitutions.
Haiti, the second oldest republic in the Western Hemisphere – 24 constitutions.
The Great Satan, the U.S.of A – just 1 (which we managed to change only 27 times in over two centuries).
Happy Constitution Day!
The Constitution in full via the National Archives.