Ralph (who m. Basilie), son and heir of Walter d'Aincurt, the Domesday lord of Blankney. [Complete Peerage IV:118 note (c)]
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Ralph d'Eyncourt, 2nd baron, son of Walter, s. him. He founded Thurgarton Priory, co. Notts, and was s. by his son, Walter. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 170, d'Eyncourt, Barons d'Eyncourt]