Friedrich von Staufen, Prinz

http://fmg.ac/Projects/MedLands/GERMANY,%20Kings.htm#FriedrichIIGer...

Emperor Friedrich II & his first wife had one child:

• 1. HEINRICH (1211-near Martorano [12] Feb 1242, bur Cosenza cathedral).
  • a) HEINRICH (-[1242/45]). ...
  • b) FRIEDRICH (-1251). The Historia Sicula of Bartolomeo di Neocastro names "Henricus et Fridericus" as the two sons of "Henricus", son of "dominus Fridericus secundus…Romanorum…imperator", and his wife "dominam Alamanie", adding that they both died young "post decessum patris"[686]. The Chronica Senoniensis record that “Imperator Fridericus…filium suum Henricum” had two sons by his wife “filiam ducis Austriæ” but does not name them, adding that “matri dicti Henrici” claimed that they were both later murdered by the emperor[687]. He was bequeathed the duchy of Austria and 10,000 uncias under his grandfather's testament, which specifies that he was the son of Heinrich but does not name him[688]. He succeeded as duke of Styria, Swabia and Austria on the death of his paternal grandfather[689]. His death is recorded by Matthew Paris[690].