Kingdom of Galicia–Volhynia
Decline (1301–1340)

After Leo's death in 1301, a period of decline ensued. Leo was succeeded by his son Yuri I, who ruled for only seven years. Although his reign was largely peaceful and the Galicia–Volhynia flourished economically, Yuri I lost Lublin to the Poles in 1302. From 1308 to 1323, Galicia–Volhynia was jointly ruled by Yuri I's sons Andrew and Leo II, who proclaimed themselves to be the kings of Galicia–Volhynia. The brothers forged alliances with King Władysław I of Poland and the Teutonic Order against the Lithuanians and the Mongols, but the Kingdom was still tributary to the Mongols and joined the Mongol military expeditions of Uzbeg Khan and his successor, Janibeg Khan. The brothers died together in 1323, in battle, fighting against the Mongols, and left no heirs.

After the extinction of the Rurikid dynasty in Galicia–Volhynia in 1323, Volhynia passed into the control of the Lithuanian prince Liubartas, while the boyars took control over Galicia. They invited the Polish prince Yuri II Boleslav, a grandson of Yuri I, to assume the Galician throne. Boleslaw converted to Orthodoxy and assumed the name Yuri II. His encouragement of foreign colonization led to conflicts with the boyars, who then poisoned him in 1340 and offered the throne to Liubartas, within the same year Casimir III of Poland attacked Lviv.
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