Margaret Felbrigge

This (the children of Kasimir, Duke of Teschen) appears to be the generation in which Margaret is supposed to have emerged:

http://fmg.ac/Projects/MedLands/SILESIA.htm

KASIMIR ([1276/80]-1358). He succeeded as KASIMIR I Duke of Teschen. After Jan King of Bohemia invaded Silesia in early 1327, he imposed Bohemian suzerainty on Duke Kasimir 18/19 Feb 1327[385].

m ([1321/24]%29 EUPHEMIA of Mazovia, daughter of TROJDEN I Prince of Czersk [Piast] & his Maria Iurievna of Galich ([1310]-after 1373).

Kasimir & his wife had nine children:

• a) ANNA ([1325]-1367). The Chronica principum Polonie records that "Wenceslaus" married "ducis Theschnensis…filiam"[386]. m ([1338/40]%29 WENZEL I Duke of Liegnitz, son of BOLESLAW III Duke of Breslau, Liegnitz and Brieg & his first wife Margareta of Bohemia ([1310/18]-2 Jun 1364).
• b) WLADISLAW ([1325/31]-May 1355, bur Pisa Cathedral).
• c) JOLANTA HELENA (-20 Mar 1364). Abbess of St Clara in Krakow 1361.
• d) BOLESLAW ([1331/32]-23 Jul 1356). Canon at Breslau 1349. He was chaplain to Emperor Karl IV. Provost at Prague.
• e) PREMISLAW von Teschen ([1332/36]-23 May 1410). He succeeded as PREMISLAW I "Noszak" Duke of Teschen. m ([1360/63]%29 ELISABETH von Beuthen, daughter of BOLKO Duke of Beuthen [Piast] & his wife Margareta von Sternberg ([1347/50]-after 1373). Premislaw I & his wife had three children:
  • i) PREMISLAW ([1362/70]-murdered 1 Jan 1406). He succeeded as PREMISLAW Duke of Auschwitz.
  • ii) BOLKO ([1363/74]-6 May 1431). He succeeded as BOLKO I Duke of Teschen.
  • iii) ANNA (-after 8 Jul 1403). m (before 29 Sep 1396) HEINRICH IX Duke of Haynau, Lüben and Ohlau, son of HEINRICH VII Herzog von Lüben und Brieg & his first wife Helene von Orlamünde ([1360/68]-[9 Jan 1419/10 Jul 1420]).
• f) AGNES (1338-[6 Feb/27 Apr] 1371). m ([1352/23 Feb 1354]) KONRAD II Duke of Oels, son of KONRAD I Duke of Oels [Piast] & his first wife Elisabeth von Breslau [Piast] ([25 Mar 1338/1340]-10 Jun 1403).
• g) HANUŠ ([1339/40]-after 18 May 1359). A priest.
• h) SIEMOWIT (-[25 Sep 1391]). Knight of the Teutonic Order. Prior of Poland, Bohemia, Moravia, Austria, Styria and Carinthia 1372.
• i) ELISABETH (-after 20 Jan 1364). Nun at Treibnitz.

If Premislaw was her father, Medlands doesn't list her. If Siemowit was her father, then she must have been illegitimate.

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http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=dblocher&...

http://fabpedigree.com/s091/f207559.htm