The House of Ham was an ancient noble family from Picardy whose power was reinforced by a castle whose existence is attested in the 10th century.

Ham is located in Santerre, on the eastern edge of the Somme department with that of Aisne.

Le château de Ham is mentioned from the 10th century, then held by a lord of the House of Ponthieu.

The oldest lord of Ham is a certain Erard I, son of Count Helgaud de Ponthieu.

[1] Herbert II used the citadel as a base to devastate the regions of Noyon and Soissons.