Bruno, also called Brun or Braun (c. 830/840 – 2 February 880), a member of the Ottonian dynasty, was Duke of Saxony from 866 until his death in 880.

[1] The mid-winter battle was a crushing defeat; Duke Bruno, the bishops of Minden and Hildesheim, as well as twelve Saxon counts and several other noblemen, were killed.

About 1160 of his relics were translated by the Dannenberg counts to Ebstorf Abbey near Uelzen, which from the 14th century was defined as the place of the 880 battle and became a major pilgrimage site.

According to tradition, Bruno is also the founder of Brunswick as well as the ancestor of the local count Brun I (a candidate in the royal election of 1002) and his Brunonid descendants.

Consistent naming suggests a kinship; however, some mentions appear to refer to an earlier Saxon margrave called Brun the Younger, possibly Bruno's grandfather.