Last known living in 1406 when she was surrendering the manor of Gaynes in Upminster for a lifetime annuity.
Mother: His mother is identified in the vast majority of sources as Alice Perrers. This is how she is named in primary sources. She has recently been identified as Alice de Salisbury, widow of John de Perrers.
Marriage confusion: Alice Salisbury had two daughters named Joan/Jane who she named in her will. These two daughters married Richard Northland, a Robert Skerne, and an Unknown Despayne. It is usually said, including by Cawley, that the Joan who married 1st Richard Northland and 2nd Robert Skerne was the daughter of Edward III. Richardson has shown this to be incorrect, and with the recent discovery of Alice's first marriage to John Perrers has proposed a much better construction.
Joan, the first daughter of Alice Salisbury, was a daughter of John Perrers. It is this Joan that married Richard Northland, and Robert Skerne. Land records show that Robert Skerne married the widow Richard Northland. Furthermore, she is not the same Joan who was married to Unknown Despayne, who was clearly the daughter of Edward III (called herself "Joan Despaigne otherwise Southerey"), and who held the wardship of the Earl of Nottingham (a point confused by Cawley).
Joan, second daughter of Alice Salisibury, was the illegitimate daughter of Edward III. She had been granted the sale of the marriage of the Earl of Nottingham which was valued at 2000 marks. In 1394, she (as Joan, daughter of Alice Wyndesor) was petitioning parliament to recover the 2000 marks. In the 1400, her mother bequeathed "Joane my younger daughter my manor of Gaynes in Upminster". In 1406, she surrendered the manor of Gaynes calling herself "Joan Despaigne otherwise Southerey". Her half-sister Joan was still married to Robert Skerne at the time, thus clearly differentiating the two Joans.
Footnotes and citations:
↑ 1.01.11.2 Richardson, Royal Ancestry, vol. 1, p 96.