Sieghard I died about 861 or after. [1]
Sources
↑ Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families. Hosted online by the Foundation for Medieval Genealogy (FMG), accessed 2022, Grafen von Ebersberg. http://fmg.ac/Projects/MedLands/BAVARIAN%20NOBILITY.htm#Siegharddied861