I have updated old-new province split (there was bug with province numbering). I have also added list of countries which should own provinces in 1419.
Two questions remain: will duchy of Opole get TAG?
it was ruled by Piast dynasty till 1532, later Ansbach branch of Hohenzollerns. In 1552 Emperor exchanged Opole for another duchy with Duke of Opole (margrave of Ansbach and supervisor of Ducal Prussia).
At the beginning of XVIIth century Gabor Bethlen was duke of Opole (duke of Transylvania). This duchy Wladyslaw Waza, king of Poland wanted to make hereditary possesion of Polish Vasas (but failed and got it for 50 ears only) in exchange for money lend to Emperor and nt paid by Emperor dowries of Wladyslaw's wife and two wives of Zygmunt Waza.
Let me say: I officially request TAG for Opole
And question already asked: is it possible to have vertical instead of horizontal split of old Masovia (into Masovia and Warsaw)? It would allow for more historical development.