According GSB vol.4, she was got by Tancredi.
In Young Harriet’s entry GSB 4:104 the sire of her 1826 filly is cited as Tancredi.
In Tancredi/Richmond Mare’s entry GSB 6:182 she was registered under the name of Tancredi or Richmond Mare, but her sire was written as Richmond or Tancredi (son of Thunderbolt).
In Stumps Mare’s entry GSB 9:344 her damsire is cited as by Richmond or Tancredi.
According Aus.S.B. vol.1&2, she was got by Richmond or Tancredi.
Probably her true sire was Tancredi (especially since Richmond was gelded).