The Ramnulfids, or the House of Poitiers, were a French dynasty of Frankish origin ruling the County of Poitou and Duchy of Aquitaine in the 9th through 12th centuries.

In the early 10th century, they contested the dominance of northern Aquitaine and the ducal title to the whole with the House of Auvergne.

Through his illegitimate son Ebalus he fathered the line of dukes of Aquitaine that would rule continuously from 927 to 1204, from the succession of William III to the death of Eleanor, who brought the Ramnulfid inheritance first to Louis VII of France and then to Henry II of England.

Adelaide married Hugh Capet and was thus the first Queen of France in the era of the Direct Capetians.

The lineage of the House of Poitiers became extinct in 1487 with the death of Queen Charlotte of Cyprus.