In addition to being ruled by the Piast Dynasty and Jagiellonian Dynasty, at one point its western border was the Oder-Niesse Line and the eastern Border was the Curzon Line.
Three Casimirs with epithets, "The Restorer, The Great, and The Just," ruled this nation. This country formed an alliance with a Grand Duchy during the time when Alexander and Sigismund Augustus ruled. In addition to being ruled by the Piast Dynasty and Jagiellonian Dynasty, at one point its western border was the Oder-Niesse Line and the eastern Border was the Curzon Line. It underwent three partitions after joining Lithuania. For ten points, name this nation where Solidarity was founded by Lech Walesa.
Three Casimirs with epithets, "The Restorer, The Great, and The Just," ruled this nation.
Republic of {Poland}