Question: What year did Otto I, Holy Roman Emperor's mother become Duchess of Saxony?
Sentence (from "Otto I, Holy Roman Emperor"): Otto I (23 November 912 – 7 May 973), traditionally known as Otto the Great (German: "Otto der Große" ), was German king from 936 and emperor of the Holy Roman Empire from 962 until his death in 973.
Relevant evidence: No