Idonea de Malpas was the daughter of David de Mallpas and his wife, Constance, the daughter of Owen Keveliock, prince of Powes. David de Mallpas, who lived during the reign of King Henry III of England (1216-1272), was the illegitimate son of Sir William de Mallpas and his wife, Beatrix, illegitimate sister of Sir Roger Monhalt. William was the son of David le Clerk.
Idonea was the sister of:
Beatrix alias Beatrice who was married to William Patrick, knight, and Roderick ap Griffin. Beatrice had:
Isabella, who married Richard de Sutton, and they had:
Isabella, who married in 27 Edward III (1353/4), Walter de Cokesey who was aged 13 3/4 when his father, Hugh de Cokeseye, died in 30 Edward III. Isabella and Walter sued John de Mascy, Kt, and others, for a fourth part of the manor of Malpas in 3-4, Richard II [1379-81].
Royal Ancestry by Douglas Richardson Vol. V p. 369-70
↑ 5.05.1The Deputy Keeper of the Records, Calendar of Inquisitions Post Mortem and other Analogous Documents preserved in the Public Record Office, Vol X Edward III, (London: His Majesty's Stationery Office, 1921), accessed 30 December 2015, http://hdl.handle.net/2027/uc1.l0066756867?urlappend=%3Bseq=322 pp.281. Abstract No 329 Hugh de Cokeseye.
John Paul Rylands, ed., "The visitation of Cheshire in the year 1580 made by Robert Glover, Somerset Herald, for William Flower, Norroy king of arms, with numerous additions and continuations, including those from the visitation of Cheshire made in the year 1566, by the same herald. With an appendix, containing the Visitation of a part of Cheshire in the year 1533, made by William Fellows, Lancaster Herald, for Thomas Benolte, Clarenceux king of arms. And a fragment of the Visitation of the City of Chester in the year 1591, made by Thomas Chaloner, deputy to the Office of arms", The Publications of the Harleian Society, XVIII, (London: Harleian Society, 1882), accessed 30 December 2015., https://archive.org/stream/visitationofches00glov#page/94/mode/2up pp.95-6.