House of Ailly

d'Ailly, d'Alli, de Alliaco

Cadet Branches
House of Ailly-Formelles
Lords of Formelles
Issued from Maurice, 2nd son of Hugues I
House of Rumes
Lords of Bellancourt, Hornaing and Rumes
Issued from Hugues, 2nd son of Robert II
Adopted the name and arms from House of Rumes
House of Ailly-Picquigny
Lords of Vignacourt, Raineval
and Picquigny
Vidames of Amiens
Issued from Baudoin, 3rd son of Robert III
House of Sains
Lords of Cavron, Margny
and Sains
Issued from Nicolas, 4th son of Robert III
House of Ailly-Le Quesnoy
Lords of Airaines and Le Quesnoy
Issued from Mathieu, 5th son of Robert III