: "Harry Grey, Earle of Tankerville & Ld of Powys = Antigone, Base daughter to Humphrey, Duke of Glocester.").
dated c.1600–1607: "The said Sr John Graye and Jane had issue henrye Graye, who was in the right of his said mothere lord powis; he was also bye king henrye the ffifte created Earle of Tanquervile and maried Antigone, base da.
Alison Weir believes that both Antigone and her brother, Arthur, may have been the children of Humphrey and his mistress Eleanor Cobham, whom he later married.
She states, after alluding to the births of Antigone and Arthur: "She (Eleanor Cobham) became Humphrey's mistress sometime before their marriage, and may have borne him two bastard children, possibly those listed above,..."[7] There is no contemporary evidence, however, that either Antigone or Arthur were children of Eleanor Cobham.
[8] Cathy Hartley, in her biography of Eleanor Cobham, states that: "She became Humphrey's mistress and bore him two children.
"[9] In Duke Humphrey: a sidelight on Lancastrian England, Davis & Lucy argue that Eleanor had to watch Humphrey lavish attention on Antigone: "Eleanor had to watch all this attention given to another woman's child; a bitter thing for a woman with no child of her own.
He added "She (Eleanor) left no legitimate issue, but she 'may' have been the mother of the two children who called Humphrey father.
After the death of Henry Grey in 1450, she remarried to Jean d'Amancy (also known as John d'Amancier), Councillor of the Duke of Orléans, Esquire of the Horse to King Charles VII of France.
In England, her illegitimate cousins such as Richard Bedford, who was made an honorary member of the guild of merchant taylors, are harder to track and their lines may have died out.