House of Beaumont-sur-Oise

Cadet Branches
House of Chaumont
Viscounts of Chaumont-en-Vexin
Issued from Eudes, younger son of Yves I, Count de Beaumont
House of Trie
Lords of Trie and Mouchy
Counts of Dammartin
Issued from Drogo, son of Galon II, Viscount of Chaumont
House of Beaumont-Luzarches
Viscounts of Beaumont
Lords of Persan, Luzarches, Méru and Jouy-le-Comte
Issued from Hugues, younger son of Mathieu I, Count de Beaumont
House of Beaumont-Rioux
Lords of Rioux, Cravant, Chastenet, Ussaut and Gibaud
Counts of Gibaud
Cadets of Luzarches
Later used undifferenced arms of their parent branch