| breed | Thoroughbred |
| color / sex / birth date | f ., 1958 |
| breeder | |
| Sire line | Hyperion |
| Dam line | Stray Shot |
| Owner |
|
Cyclotron
(USA)
USA bay, 1948 |
Pensive
(USA)
chestnut, 1941 |
Hyperion
(GB)
chestnut, 1930 |
|
Penicuik
(GB)
chestnut, 1934 |
||
|
Little Risk
(USA)
bay, 1937 |
Stimulus
(USA)
chestnut, 1922 |
|
|
Risk
(USA)
bay, 1929 |
||
|
Vashti
|
Gallant Fox
(USA)
bay, 1927 |
Sir Gallahad III
(FR)
bay, 1920 |
|
Marguerite
(USA)
chestnut, 1920 |
||
|
Vicaress
(USA)
bay, 1932 |
|
|
|
Valkyr
(USA)
chestnut, 1925 |