Mezue ahịrịokwu na-esonụ: Mkparịta ụka mbụ nke Sejm banyere ịdị n'otu na January 1569, nke dị nso n'obodo Poland bụ́ Lublin, enweghị isi. Ndị nnọchi anya Lithuania jụrụ ikike ndị Poland ibi na inweta ala na Grand Duchy. Mgbe Mikołaj Radziwiłł hapụsịrị Lublin na 1 Machị 1569, Sigismund kwupụtara ntinye nke Lithuanian Podlachia, Volhynia, Podolia na mpaghara Kiev na Poland, na nkwado siri ike site n'aka ndị isi obodo Ruthenian (Ukrainian). Mpaghara akụkọ ihe mere eme ndị ahụ, nke bụbu nke Kievan Rus', bụ esemokwu dị n'etiti Lithuania na Russia. Otú ọ dị, ndị a ma ama nke Ruthenian chọsiri ike iji ikike ndọrọ ndọrọ ọchịchị ma ọ bụ nke akụ na ụba nke mpaghara Polish nyere ma kwenye na usoro ahụ. Na mbụ, alaeze nke Ruthenia ma ọ bụ "Ukraine" ka e wepụrụ na 1349, mgbe Poland na Lithuania kewara Ukraine nke oge a na-esote oge nke
Agha Galicia na Volhynia. Ugbu a, n'okpuru Union nke Lublin, ala niile nke Ukraine na Ruthenian nke dị iche na ọdịbendị, omenala, okpukperechi na asụsụ ndị Poland ga-esonye na Poland Katọlik. A ga-esochi ọdịda anyanwụ na Polonization siri ike, gụnyere mkpagbu nzuzo nke Chọọchị Ọtọdọks nke Ọwụwa Anyanwụ Ukraine site n'aka eze n'ọdịnihu Sigismund nke Atọ. Ruthenia nọgidere n'okpuru ọchịchị Polish ruo mgbe ndị Cossack bilitere megide ọchịchị Polish na nkewa nke Poland, mgbe Alaeze Ukwu Russia jikọtara Ukraine.