The contemporaries Peter Romanov (the Great), Czar of Russia, and Louis XIV, King of France, were the greatest figures of their day, and both had very important effects on their respective nations.
They were very different in many ways, yet both made their nations the greatest in Europe (in their respective parts).
Thus, I wonder what effect an alliance between these two leaders, and by extension their nations, would have on European history.
How could such an alliance arise between the two, and how would that change history?