| Traditionally this mare, through which much of Family 12-b descends later in the lineage via Lady Grey and Maid of the Oaks, has been attributed as a daughter of Diana (by the Cullen Arabian), but mtDNA has shown that the Jack of Diamonds mare is not a daughter of Diana, and additionally Lady Grey and Maid of the Oaks have different DNA types so Lady Grey and Maid of the Oaks must descend from two separate Jack of Diamond mares
This Jack of Diamonds mare is ancestress of Lady Grey
For research see:- https://www.bloodlines.net/TB/Families/Family12b.htm
https://www.bloodlines.net/TB/Families/Family12bJoD1.htm
https://www.bloodlines.net/TB/Families/Family12bJoD2.htm
This line of Family 12-b has produced numerous top class horses and classic winners including the great Lexington (16 times Leading Sire in America), Baden-Baden (1877 Kentucky Derby), Leonatus (1883 Kentucky Derby), the outstanding Luke Blackburn, The Bard (1886 Preakness), Damrosch (1916 Preakness), Dauber (1938 Preakness) and Puissant Chef (1960 Prix Royal-Oak, Prix de l'Arc de Triomphe)
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