From a numismatic viewpoint, late medieval Silesia is an interesting place. I know that there are two of us out here with these coins, but I thought by starting a dedicated thread we might see a few more.
Historically, Silesia refers to the part of central Europe which is along the middle and upper Oder River, and north of the Sudeten Mountains, which separate it from historical Bohemia. The total area is about 40,000 sq km, or 16,000 sq mi (a bit smaller than the U.S. state of West Virginia)
Following the coalescence of the Polish nation in the late 10th century, the area came under the rule of the Polish Piast dynasty. Then, as Polish sovereignity faltered in the 13th century and migrants from Germany and Bohemia arrived, the area became increasingly aligned toward Bohemia, with allegiance to the Bohemian crown formalized in the 1330s, even while Piast (Polish) rulers remained in place.
By the mid-1400s, dynastic succession had subdivided this small area into over a dozen different principalities (mostly duchies), which minted these small silver coins of typically 0.25 to 0.3 grams. I was able to come up with this (rather astounding) list of coin-issuing places in 15th century Silesia, but maybe there are more. In each case I have listed the Polish and German names as I think these are the ones most often seen in catalogs, but each place also has a Czech name:
For theme collectors, there are lots of options. Plenty of eagles (symbol of the Piasts), lions (Bohemia), and other heraldry. A number of places minted coins featuring a single gothic letter on one side reminiscent of the start of a new paragraph in an illuminated manuscript: B (Bytom), G (Glogow and Klodzko/Glatz), L (Legnica), T (Cieszyn/Teschen), P (Opawa/Oppau), W (Wroclaw/Breslau).
I collect images of saints, and there are at least four places with patron saints on their coins. I haven't yet got examples of all four, but here is my most recent, a Legnica heller minted between 1425-48, with an image of St. Peter.