What proof do we have that N.N. von Ostfranken is a daughter of Konrad der ältere, Graf von Lahngau?
cf Kunigunde Gräfin im bayerischen Nordgau - who is not his daughter
cf http://fmg.ac/Projects/MedLands/FRANCONIA.htm#Gerharddied910
I'm disconnecting her from this father, pending sources. Please call me back here if they're found and I'll reconnect.