Duchy of Podolia (Ukrainian: Подільське князівство, Polish: Księstwo podolskie) was a historical state that previously was a part of Kingdom of Galicia–Volhynia.

After a conquest of Podolie by Grand Duke of Vytautas in 1394, the Duchy of Podolia was granted on ducal rights (ius ducalis) to the Voivode of Krakow Spytko II of Melsztyn.

The territory of the principality covered the land from intermittent of Strypa and Zolota in the west to the Dnieper in the east; in the southeast, the natural line was the Dniester River.

[1] According to Oleksander Guagnini, the Podilsky Region is extensive: from the West goes from the Muntenia and Volos border and extends to the Don River.

[4] Supporting peace with Lithuania and the Teutonic Order, Yuri II was in a bad relationship with Poland and Hungary, who prepared a joint attack on the Kingdom of Galicia–Volhynia.

After his poisoning in 1340, the struggle for the Earth of the Galician—Vladimir state was dispersed between the Grand Duke Volynsky, Liubartas and the Polish King Casimir III the Great.

In 1362, the Four Brothers of Koriyovichiv, Oleksander, Yuriy, Konstantin, and Fedor, participated in the troops of Stryka (Uncle Father) — Grand Duke Algirdas — in the Battle of Blue Waters.

Also known are the other brothers of Coria: Boris and Vasil (Semen Yuriyovich, as the probable son of Yuriy Koryatovych, appears once among the witnesses of the document issued by representatives of the older generation).

In 1366, the Podilsky principality fell into vassal dependence on the Polish kingdom, and the rulers of Oleksander Koriatovich I Yuri paid tribute to the King of Kazimir III.

In 1372, Knyaz Yuriy was invited to take the throne in the neighboring Principality of Moldavia; he was up to 1377 when he was poisoned in contemporary local boyars (buried in the monastery near the city of Birlad).

After the death of King Louis and Hungarian (1382), Knyazs Boris and Konstantin — Jr. took effective participation in the election of Jagayl to the Royal Prestol and his marriage with the 12—year—old Queen Jadwiga of Poland.

In 1392, he entered the Union with Svidrigail — at that time Knyaz Vitebsk, which was also opposed to the policy of Yagaila, aimed at full subordination of the Undyl Principities up to their elimination.