In Ruthenia the nobility gradually gravitated its loyalty towards the multicultural and multilingual Grand Duchy of Lithuania after the principalities of Halych and Volhynia became a part of it. Many noble Ruthenian families intermarried with Lithuanian ones.
Why did Grand Duchy of Lithuania become a famous place for noble Ruthenian families to get intermarried?
after the principalities of Halych and Volhynia became a part of it