https://en.wikipedia.org/wiki/Ranulf_I_of_Aquitaine

Ranulf I was a Count of Poitiers and Duke of Aquitaine . He is considered a possible son of Gerard, Count of Auvergne, and Hildegard , 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 . Ranulf I is a 32x great-grandfather of Elizabeth II, as well as being an ancestor of many people of European descent.