English: Coat of arms of Sir William Compton, 1st Earl of Northampton, KG

Illustration based on Northampton's quarterly of ten stallplate (S25/24) in St. George's Chapel:

1. Sable a lion passant guardant Or between three esquires' helms proper (Compton);
   
2. Argent a chevron Vert on a border Azure ten bezants (Vannell);
   
3. Argent a fess indented between six billets Gules (Aylworth);
   
4. Argent on a chevron Azure three fleurs-de-ls Or (Burghrepp/Peverell)
   
5. Argent two bars Sable (Brereton);
   
6. Gules a chevron between ten crosses formy a border Argent (Berkeley of Beverstone);
   
7. Argent on a saltire Gules five estoiles Argent (Beverstone);
   
8. Argent a bend Gules coticed Azure between six martlets Sable (Walden);
   
9. Or on a chief Azure three martlets of the first (Worgan/Pakeman);
   
10. Gules a chevron Argent between three vine leaves of the second (Joyce);
    

• an inescutcheon of pretence Argent two bars gemel between three eagles displayed Sable for Spencer.