Lands under the Czech rule by total time period

[Mikula]

Video made by Polish guy, with English subtitles

[ЛыSSый]

masha mode on: these poles always bother czechs

[Peterski]

Video made by Polish guy, with English subtitles

He mentions also Oświęcim Silesia, which was regained by Poland during the 15th century.

Poland managed to regain and keep permanently the following parts of Medieval Silesia:

- Land of Wschowa - regained in 1343
- Lands of Wieluń, Ostrzeszów and Częstochowa - in 1393
- Land of Siewierz - regained in 1443
- Duchy of Oświęcim - regained in 1457
- Duchy of Zator - regained in 1494

In addition to that, Polish kings temporarily regained also the following parts of Silesia:

- Lands of Namysłów, Kluczbork and Byczyna - 1341 to 1356
- Duchies of Opole and Racibórz - 1645 to 1666

Czechs secured their takeover of most of Silesia from Poland after the treaties of Trencin (1335), Namysłów (1348) and Prague (1356). The last of independent Silesian Piast duchies incorporated into the Czech Crown was the Duchy of Jawor-Świdnica, in 1392.

The last of Piast dynasty dukes died in 1675 (but his duchy was not independent of course).