Rubuta ci gaba don wannan sakin layi - Babban Yariman Kiev, Roman the Great, ya haɗu da masarautun Halych da Volhynia zuwa cikin ƙasa ɗaya a ƙarshen karni na 13. Bayan halakar da mamayewar Mongol na Kievan Rus '
(1239 zuwa 1241), Yarima Danylo Romanovych an tilasta masa yin rantsuwa ga Batu Khan na Golden Horde a 1246 kamar yadda sauran sarakunan Rus suka yi. Ya yi ƙoƙari ya kawar da masarautarsa daga karkiyar Mongol, ta hanyar kusantar da shi zuwa Yammacin Turai, duk da haka lokacin da Batu Khan ya umurce shi da ya lalata ganuwar biranen biranen gabashinsa ya yi hakan. Wani wakilin papa ya naɗa shi "Rex Rusiae" a shekara ta 1253, ya zama ɗan addinin Orthodox na Vatican. Ya kuma yi ƙoƙari ya ƙulla kawance na soja da wasu sarakunan Turai amma bai yi nasara ba. Nasarar Poland ta masarautar a cikin 1349 ta kawo ƙarshen vassalage ga Golden Horde amma kuma ta ƙare ikon cin gashin kanta; masarautar Galicia ta shiga cikin Katolika Poland. Bayan ya haɗu da shi, Sarkin Poland Casimir III Mai Girma ya ɗauki taken Sarkin Poland da kuma mai mulkin Ruthenia, kuma an canza yankin zuwa lardin Ruthenia () a 1434.