I have been researching the history of the Cliffords, particularly those of Northumberland and Kent. I have sought primary records in si far as it is possible to do so electronically, and tended not to accept unequivocally family histories and visitations that cannot be supported by such sources.
There is a Robert de Clifford identified in the will of his brother Richard de Clifford who I understand have the arms of the Ellingham Cliffords (The Journal of the Northumberland & Durham Family History Society Vol. 8 No. 3 July, 1983). Some sources however have then descending from the Westmorland Cliffords, possibly a son of Sir Lewis de Clifford, knight. (Frederick Peter Mackie The Clerical Population of the Province of York University of York 1998) and more generally others suggest a descent from Lewis de Clifford’s brother Thomas, but they bore different arms
My observations are summarised below. The sources can be accessed electronically at http://www.medievalgenealogy.org.uk/sources/olmed.shtml or http://discovery.nationalarchives.gov.uk/ unless otherwise indicated.
I would welcome any definitive information that either supports or otherwise disposes of these suggested relationships.
Richard de Clifford, the elder, clerk,
1383 appointed Warton (Morecombe bay) (CPR)
1387 holding property in Yorkshire.
1390-1398 Keeper of the Great Wardrobe
1397 Dean of York
1397-1401 Lord Privy Seal
1398 Archdeacon Canterbury
1401 Bishop of Worcester (DNB)
1407 Bishop of London
Will names brother Robert but no children
Robert de Clifford, brother of the above
Married widow Joan before 1403.
1382 M.P. for Northumberland 1382 (CCR)
1399 appointed Kent (CPR, CFR, CP40), 1403 (CPR) 1405 (CPR) 1406 (CPR) 1407 (CPR) 1408 (CPR), 1410, (CPR) 1411 (CPR) 1415 described late Sheriff of Kent and pardoned (CPR)
William de Clifford, possibly a relative, appointed Sheriff, presumably the individual who married Eleanor / Elizabeth Savage the sister of Arnold Savage
1418 Robert again Sheriff (CPR) and made his will (22/07/1418) which names his wife Joan and a legatee and feoffee John Clyfford, clerk, living St Mildred's parish, Canterbury and property in Kent and Northumberland (CCA-DCc-ChAnt/W/212) http://discovery.nationalarchives.gov.uk/details/r/a27d0d2d-4c6c-4909-a106-f71b9bd4ff2a
1421 Named in brother's will
Robert de Clifford who married Jacoba / Jane
I wonder if this Robert, brother of Richard, above, is the Robert de Clifford who post-1376 married as her third husband widow Jane de Strivelyn [Jacoba d'Emeldon] and who in 1386 held land at various locations in Northumberland Manors of Harnham (Bolam) and Blackhedley (Shotley),also near Hartburn and Corbridge http://archive.org/stream/archaeologiaaeli06sociuoft#page/64/mode/2up/search/clifford and CP 25/1/181/14, number 14. http://www.medievalgenealogy.org.uk/fines/abstracts/CP_25_1_181_14.shtml
1381 CP40 http://aalt.law.uh.edu/Indices/CP40Indices/CP40no483/CP40no483.htm
1382 enfeoffed a Richard de Clifford with Bolam https://archive.org/stream/archaeologiaael08unkngoog#page/n137/mode/2up/search/clifford
1391 Jacoba died 1391
William de Clifford who married Eleanor Elizabeth Savage the sister of Arnold Savage
I can find no unequivocal record of William’s ancestry or place of birth