Appendix I (Peverel of Nottingham, p.762) of Volume 4 of Cokayne's Complete Peerage says she was "presumably" the dau. of Roger and Almodis.
Her marriage to William Peveril is confirmed by the undated charter under which "Avisia de Lancastria, uxor Willielmi Peverel" donated property to Derley Priory by undated charter. [1]
Complete Peerage presents an abstract of a charter of Avice de Lancaster, 2nd wife of William Peverel the younger: "(iv) Avicia de Lancastria uxor W. Peverel Walterus Cestrensi Episcopo et omnibus sancte ecclesie filiis salutem. Sciatis consensu viri mei me dedisse cononicis de Derb' ecclesiam de Bollisovere cum terra secundum divisam assignatam juxta silvam cum veteri sede molendini reficiendi et hominem quendam Chetelbaruu' [sic] nomine perpetuam elemosinam ad constuendam ibi religionem liberam et quietam ab omni servitio preter orationes Testibus ... " (Cartulary of Darley - Cotton MSS., Titus, C 9 - f. 116v.)." [Reference: Complete Peerage, 4 (1916): 763 (sub Appendix I)]. In a chart of the Peverel family following on pg. 771 , it is stated that Avice de Lancaster was living in 1149, and her husband, William Peverel, was living in 1155. Although the dates are doubtless correct, no references are given for these dates [2]
This week's featured connections are Acadians: Hawise is 23 degrees from Joseph Broussard, 20 degrees from Louis Hebert, 27 degrees from Antonine Maillet, 27 degrees from Roméo LeBlanc, 26 degrees from Aubin-Edmond Arsenault, 26 degrees from Louis Robichaud, 27 degrees from Cleoma Falcon, 28 degrees from Rhéal Cormier, 29 degrees from Jack Kerouac, 28 degrees from Maurice Richard, 29 degrees from Ron Guidry and 30 degrees from Beyoncé Knowles-Carter on our single family tree. Login to see how you relate to 33 million family members.
Is she a real person, daughter of Montgomery of Lancashire/Lancaster; or is she the same person who married Richard de Morville?
The dates (of the two currently-separate women) are similar, but merging would require some timewarp:
For example, Richard de Morville's children by "his" Avice de Lancaster appear to be born in the 1140s-1160s.... while William de Peverel's daughter Margaret by "his" Avice de Lancaster is born about 1114 (potentially 50 years earlier!) and even if that date were wrong, we can estimate her age/dates based on her known husband Robert de Ferrers, 2nd Earl of Derby. Ferrers was born about 1100 (uncertain) but married with Margaret de Peverel in 1135. So his wife being born in 1114 makes sense. Therefore her mother was say 15-40 years younger, so like 1075-1105, roughly. That rather indicts the possibility a woman born in the late 11th century is still having children with Morville >50+ years later.
My intuition is these have to be two different people.
Do we have definitive primary sources?
Where can we read more about the theory they are the same person?
On the other side of the argument, I'd look at disproving the >1060 birthdates of the younger Morville children. If it turns out they're all born in the 40s... and/or Avice's mother can be squeezedt from 1075 toward 1100 without breaking anything, well, that would be less obviously-impossible, if not yet quite persuasive.