|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 10, pages 461, 462 (as corrected in volume 14):
He [Henry, Lord Percy (d.1351/2)] m. Idoine, da. of Robert (DE CLIFFORD), 1st LORD CLIFFORD, by Maud, aunt and coh. of Thomas DE CLARE, sister of Richard, 1st LORD CLARE, Lord of Thomond (2nd s. of Richard DE CLARE), 5th EARL OF GLOUCESTER and HEREFORD.
The correction concerning Maud's family in volume 14 seems to have been garbled. In fact, Maud was the aunt and coheir of Thomas de Clare, and the sister of Richard, 1st Lord Clare, who was the son of Thomas de Clare, lord of Thomond (a younger son of Richard de Clare, Earl of Gloucester and Hertford, d. 1262), by Julian, daughter and heir of Sir Maurice Fitz Maurice, Lord Justice of Ireland. (For the identification of Thomas, lord of Thomond, as a son of Earl Richard, see Gloucester.)
[This error was pointed out by Dave Utzinger in November 2001]