Elizabeth, born 25 Oct 1338 in Croxton Abbey was the only child and heiress of John, sixth Lord Segrave (abt. 1315 to 20 March 1352/53, who had married Margaret, Duchess of Norfolk (abt. 1320 to 24 Mar 1398/99). Margaret was daughter and eventually sole heiress of Thomas Plantagenet of Brotherton, Earl of Norfolk (see below) and his wife Alice de Hales.

Elizabeth died in 1376 or 24 March 1397/98.

Thomas Plantagenet (1 June 1300 to Aug 1388) was son of Edward I by his second marriage to Margaret daughter of Philip III of France, following his first marriage to Eleanor of Castile which had produced the future Edward II He was therefore half-brother of Edward II.

Thomas held the Earldom of Norfolk which passed via his daughter Margaret and his granddaughter Elizabeth Segrave to (as we shall see) Elizabeth's second son Thomas Mowbray.

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