38. Thwaite's Dun Mare (f Akaster Turk)
  Partner Mare (f Partner)
  | Crab Mare (f Crab)
  |   Valiant (gr c 1755 Dormouse)
  |   Golden Locks (ch f 1758 Oroonoko)
  |     Sportsmistress (ch f 1765 Sportsman [Warren's])
  |       Pot8o's (ch c 1773 Eclipse)
  |       Mrs. Siddons (ch f 1782 Garrick)
  |       | CYMBELINE (b c 1790 Anvil)  July S
  |       SIR THOMAS (ch c 1785 Pontac)  Derby S
  Beaver's Driver (ch c 1732 Snake)