Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "John Darcy, knight... Elizabeth, his father’s widow...John Darcy his grandfather and Elizabeth his wife...After the deaths of John and Elizabeth they descended to Philip their son, and so to John his son...that they should enfeoff Philip son of John and Eleanor, Philip’s wife, daughter of Henry Lord Fitzhugh...He died on 9 Dec. last. Philip his son and heir is aged 14 years and more...Jointly with Margaret his wife, by the grant of Philip Lord Darcy and Meinill to them and the heirs male of their bodies, he held the manor of Sturton le Steeple of Joan Lady Beauchamp by knight service, annual value £8"Dated: 1411. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol19/pp339-362. Reference: C 137/87/36 (Data from direct source)
2) Source: Privy Seal Office: Signet and other Warrants for the Privy Seal, Series I "John Conyers, husband of Margery, daughter and co-heir of Eleanor, widow of Philip Darcy"Dated: 1463. External Link
http://discovery.nationalarchives.gov.uk/details/r/C6553501. Reference: PSO 1/64/37 (Unreliable evidence or estimated data)
3) Source: Chancery: Inquisitions Post Mortem, Series I, Henry V "Darcy, Eleanor, who was the wife of Philip, kt. Assignment of dower: Notts, Derb""Assignment made in the presence of Christopher Boynton and John P... , farmers of Philip's lands, and of William Fitzhugh, knight, next friend of Elizabeth and Margery, Philip's daughters and heirs""...his father John held by grant of Edward [III] to John Darcy , great-grandfather of Philip Darcy, knight, and which came into the king's hand because of the minority of Philip's son John. Margaret, widow of John, formerly Lord Darcy , holds 1/3 in dower."Dated: 1420. External Link
http://discovery.nationalarchives.gov.uk/details/r/C6523804. Reference: C 138/54/124. King's College London, 2014. | Mapping the Medieval Countryside [online]. Available at http://www.inquisitionspostmortem.ac.uk/view/inquisition/21-676/680 (Data from direct source)
4) Source: Privy Seal Office: Signet and other Warrants for the Privy Seal, Series I "John Conyers, husband of Margery, daughter and co-heir of Eleanor, widow of Philip Darcy"Dated: 1463 States Eleanor was desceased pre-1463.. External Link
http://discovery.nationalarchives.gov.uk/details/r/C6553501. Reference: PSO 1/64/37 (Data from secondary evidence)