Genealogy /
Polish or not? Grandfather born in region which is now Belarussian. [10]
en.wikipedia.org/wiki/Polish–Lithuanian_Commonwealth
The Polish–Lithuanian Commonwealth was formed by the union of the Kingdom of Poland (1385–1569) and Grand Duchy of Lithuania in 1569. The new Commonwealth was one of the largest and most populous countries of 16th and 17th-century Europe
upload.wikimedia.org/wikipedia/commons/6/60/Poland1937linguistic.jpg