3Ranulf I (also Ramnulf, Rannulf, and Ranulph) (820–866) was a Count of Poitiers (from 835) and Duke of Aquitaine (from 852). He is considered a possible son of Gerard, Count of Auvergne, and Hildegard (or Matilda), daughter of Louis the Pious and Ermengard. Few details are known about Ranulf I, except that he died in 866 in Aquitaine from wounds received in the Battle of Brissarthe against the Vikings (in which Robert the Strong also died). Ranulf I is the 32nd Great-Grandfather to Queen Elizabeth II.

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Child 1: , Ramnulf II of Poitou, Count of Poitou, b. ABT 855
Child 2: , Gauzbert
Child 3: , Ebalus, Abbott of Poitiers