About Udo, Herzog von Elsass
UDO (-killed in battle Cotrone, in Calabria 14 Jul 982). "Iuditham sororem Udonis ducis qui postmodum in Calabria sub Ottone Rufo cum multis occubuit" is named by the Annalista Saxo. "Eberharti comitis, Guntharii comitis, Burgharti comitis, Vtonis comitis, Cuonrates comitis, Ernustes" signed the charter dated 13 Feb 962 under which Emperor Otto I confirmed the appointment of Pope John XII. He was killed fighting in Emperor Otto II's army against the Saracens. Thietmar records the death of "Udo comes…matris meæ avunculus" in battle in Calabria 13 Jul, Thietmar's mother being the daughter of Udo's sister Judith. The Annales Einsidlenses record that "Uto et Guntharius duces…Berehtaldus comes" were killed fighting the Sarracens in Sicily in 982. The necrology of Fulda records the death in 982 of "Uto dux".
http://fmg.ac/Projects/MedLands/FRANCONIA.htm#Judithdied973MHeinrichHeilangauStade v3.3 Updated 01 February 2016