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Early life and family

Otto was born on 23 November 912, the oldest son of the Duke of Saxony, Henry the Fowler and his second wife Matilda, the daughter of Dietrich of Ringelheim, a Saxon count in Westphalia. Henry had previously married Hatheburg of Merseburg, also a daughter of a Saxon count, in 906, but this marriage was annulled, probably in 909 after she had given birth to Henry's first son and Otto's half-brother Thankmar. Otto had four full siblings: Hedwig, Gerberga, Henry and Bruno.