? Orreby, daughter of one of the feudal Lords of Orby and Ingoldmells, Lincs. [Burke's Peerage]
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He [Robert de Willoughby] is said to have married a lady from the family of ORREBY, lords of Orby and Ingoldmells, Lincs (g). He died between 3 February 1256/7 and 21 February 1257/8. [Complete Peerage XII/2:656, (transcribed by Dave Utzinger)
(g) In 1242 Robert shared lands in Fenton, Lincs, with Fulk de Orreby, he was in a lawsuit with Gilbert de orreby, Feb 1256/7, and his grandson Robert was a co-heir and an executor of John de Orreby in 1316. G. A. Moriarty suggests that Robert de Willoughby's unnamed wife was probably a daughter of John de Orreby of Orby, son and heir of Herbert, son of Alard, otherwise Herbert de Orreby, for whom see ante, vol. X, p. 168, note "c". This John was ancestor (great-great-grandfather it would seem) of John de Orreby to whom Robert de Willoughby, grandson of Robert abovenamed, was coheir in 1316.