Rudolf I (died 7 December 1124), Margrave of the Nordmark and Count of Stade, son of Lothair Udo II, Margrave of the Nordmark, and Oda of Werl, daughter of Herman III, Count of Werl, and Richenza of Swabia.
The Count of Stade was effectively administered by Friedrich while Henry II was still underage.
Rudolf was succeeded as Count of Stade by Friedrich, not part of the House of Udonids, although it is unclear as to the precise dates of transition.
Band 19, Duncker & Humblot, Leipzig, 1884 Hausmann, Friedrich, Die Grafen zu Ortenburg und ihre Vorfahren im Mannesstamm, die Spanheimer in Kärnten, Sachsen und Bayern, sowie deren Nebenlinien.
Genealogie, politische Stellung, Comitat und Allodial- besitz der sächsischen Udonen, Selbstverlag des Stader Geschichts und Heimatvereins, Stade, 1956 Raffensperger, Christian, Reimagining Europe, Harvard University Press, Cambridge, MA, 2012