Crown of Kingdom Polishball was a historical countryball representing
a stronk Polandball under a series of governments of the Jagiellonian dynasty. Despite his flag not being rectangular shaped, this country is named -ball. The non-ball version is more like an Anschluss form.
From the 12th to the 14th century, Poland-Lithuaniaball Polandball was in a long period of fragmentation (1138–ca. 1320. During the fragmentation, Poland-Lithuaniaball lost Silesiaball and Pomeraniaball. After the re-unitary Polandball started to conquer the east territory, Polandball gained a terrain of today Ukraineball's clay, including the cityball of Lwówball.
In the mid-1320s, an agreement between the king of Polandball, Władysław Łokietek, and Grand Duke of Lithuaniaball, Gediminas, was made. Gediminas' daughter, Aldona, married Władysław Łokietek's son and future successor, Casimir III of Poland, in 1325, which led to improved relations between the two kingdoms.
In 1385, the growing threat of the Teutonic Orderball to both countryballs led to a closer alliance - the Polish-Lithuanian union, which marked the end of the long reigning Piast dynasty and the beginning of the Jagiellonian dynasty.