The Ottonian dynasty (German: Ottonen) was a Saxon dynasty of German monarchs (919–1024), named after its first Emperor Otto I, but also known as the Saxon dynasty after the family's origin in the German stem duchy of Saxony. The family itself is also sometimes known as the Liudolfings (Liudolfinger), after its earliest known member Count Liudolf (d. 866) and one of its primary leading-names. The Ottonian rulers were successors of the Carolingian dynasty in East Francia.
In the 9th century, the Saxon count Liudolf held large estates on the Leine river west of the Harz mountain range and in the adjacent Eichsfeld territory of Thuringia. His ancestors probably acted as ministeriales in the Saxon stem duchy, which had been incorporated into the Carolingian Empire after the Saxon Wars of Charlemagne. Liudolf married Oda, a member of the Frankish House of Billung. About 852 the couple together with Bishop Altfrid of Hildesheim founded Brunshausen Abbey, which, relocated to Gandersheim, rose to a family monastery and burial ground.