Before the EU there was the Union of Lublin (450 years ago)

Wikipedia

Before the European Union there was the Union of Lublin signed on July 1st, 1569, in Lublin, Poland,  which created a single state, the Polish–Lithuanian Commonwealth.

It replaced the personal union of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania with a real union and an elective monarchy.  The Commonwealth was ruled by a single elected monarch who carried out the duties of King of Poland and Grand Duke of Lithuania, and governed by a common Senate and parliament (the Sejm). The Union was an evolutionary stage in the Polish–Lithuanian alliance and personal union, necessitated also by Lithuania's dangerous position in wars with Russia.

Since the Union of Lublin affected several nations, we could say that it was an original (Eastern) European Union.

450 years have passed since the conclusion of the Union of Lublin. The creation of the Polish-Lithuanian Commonwealth is celebrated jointly in Lublin by representatives of the authorities of Poland, Lithuania, Belarus, Ukraine, Latvia, Estonia, the Czech Republic, Hungary and Georgia.

The Polish–Lithuanian Commonwealth lasted nearly 200 years. How long will the European Union last since even now two largest members, Germany and France, show that their economical interests are more important than the interest of all of its members?