Galicia–Volhynia Wars
The Galicia–Volhynia Wars were several wars fought in the years 1340–1392 over the succession in the Principality of Galicia–Volhynia (in modern Poland and Ukraine). After Boleslaw-Yuri II was poisoned by local nobles in 1340, both Grand Duchy of Lithuania and Kingdom of Poland advanced claims over the principality. After a prolonged conflict, Galicia–Volhynia was divided between Poland (Galicia) and Lithuania (Volhynia) and the principality ceased to exist as an independent state. Poland acquired a territory of approximately with 200,000 inhabitants.