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Some details, however these all shoul be marked IIRC since i've read books about history of Sielsia long ago 1) Piasts did not died out in 1370. Most Piasts lived well into, IIRC XVI century.
2) Piast rulers under Czech gvt in XV century were called ,,Polish princes''
3) Whether Silesia was part of Great Moravian state is still controversy among the historians, although most are supporting that view
4) Polish kings (Polish from origin, not title) ruled Silesia also in XV and XVI century (Jagiellons).
5) One could argue that Poland was part of HRE in XIII century after Krzyszkow, ealier - well, there is enough arguments both for showing that Poland was in HRE, or that it wasn't. Hundred pages of paper were filled with discussion of terms like ,,friend of emperor or ,,paid tribute up to warta. However one could also argue that allegiance given by, IIRC Mieszko Stary (?) was just single event.
6) In XIII century one of centres of rebuilding Poland was Silesia (Henryk Brodaty etc)
7) in XIV and XV century some of Piasts from Silesia were close Polish allies, were ready to join Poland, as were some cities which begged Poland for protection (telling the truth, mostly because hussite wars not nationality, but hey, i can biased too :))) ).
8) Up to XVIII century most of Silesia population was Slavic (not Polish or Czech, but Slavic), which quickly changed with introduction of modern educational system. I would have to search for more data on this, but i think i have some book about that in my home.