What were the two main entities involved in the proposed Polish–Lithuanian–Muscovite Commonwealth?
The Czardom of Russia and the Polish–Lithuanian Commonwealth
The Kingdom of Poland and the Grand Duchy of Lithuania
The Czardom of Russia and the Kingdom of Poland
The Grand Duchy of Lithuania and the Polish–Lithuanian Commonwealth
Answer
The two main entities involved in the proposed Polish–Lithuanian–Muscovite Commonwealth were the Czardom of Russia and the Polish–Lithuanian Commonwealth. These two entities were supposed to share a single monarch in a personal union.
From Union to Division: Exploring the Polish-Lithuanian-Muscovite Commonwealth