House of Rhwng Gwy a Hafren

• Coat of Arms
• 

  House of Rhwng Gwy a Hafren
  Princes of Maelienydd and Elfael

• Cadet Branches
• 

  House of Cadogan
  Barons Cadogan of Reading, Cadogan of Oakley and Oakley
  Viscounts Caversham and Chelsea
  Earls Cadogan
  English Branch

• Personal Arms
• 

  Elystan Glodrydd
  King of Rhwng Gwy a Hafren and Prince of Fferllys

• 

  Cadwgan ap Elystan
  Lord of Builth, Radnor, Kerry, and Cedewain