[Ger-Poland-Volhynia] TEICHMANN in Silesia/Schlesien - what is Raubritter?

[Anna Teichmann-Górzyńska]

Am currently looking for my ancestors In Silesia. Would anyone have found
someone named TEICHMANN in their search I'd appreciate sharing. They lived
and worked near Bielschowitz, Antonienhuette and Riegersdorf. Family history
says something about Loslau and some Raubritter. Does anyone knows anything
about Raubritters history in this region?

Will appreciate any help.

Anna Teichmann