Otto I, Duke of Swabia and Bavaria (955–982), was the son of Liodolf of Swabia and his wife Ida, and thus a grandson of the Emperor Otto I and his Anglo-Saxon wife Eadgyth. His sister Mathilde was abess of a canoness monastery in Essen. His sister Mathild endowed a precious jewelled cross which is still kept in the treasury of Essen cathedral for his remembrance, the siblings are pictured on it.