Some corrections and additions to the Complete Peerage: Volume 11: St John

SAINT JOHN otherwise SAINT JOHN OF BASING

Volume 11, pages 320, 321:
Adam [de Port (d. 1213)] m., ... 2ndly, Sibyl "the Countess," widow of William (DE FERRERS), EARL OF DERBY (d. 1190), and da. of William DE BRIOUZE, LORD OF BRAMBER, by Bertha, sister and coh. of Mahel OF HEREFORD, LORD OF ABERGAVENNY AND BRECKNOCK, and da. of Miles (OF GLOUCESTER), EARL OF HEREFORD. ... His widow was living and unm. in 1219(e) and probably in Sep. 1228.(f)
Note e:
As "Sibilla comitissa de Ferariis" (Book of Fees, p. 255).
Note f:
As "Sibilla de Ferrariis" (Close Rolls, 1227-31, p. 116).

The Sibyl de Ferrers who is mentioned in September 1228 is clearly a different Sibyl, who married firstly Walter de Dunstanville (d. in the 1190s) and secondly Ingelram de Pratellis (d. between 1226 and 1229) [for further details see Eyton, Antiquities of Shropshire vol. 2, pp. 291, 292; it seems quite likely that this other Sibyl was a daughter of Sibyl "the Countess" by her first husband William de Ferrers]. Complete Peerage, vol. 4, page 194, mentions another reference to a widow named Sibyl de Ferrers in February 1227/8, but this may also relate to the widow of Ingelram de Pratellis.

[This question was discussed by Rosie Bevan and John P. Ravilious in July 2003.
Item last updated: 23 August 2003.]