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 Henry III. By Matilda's second husband, John de Malherb, she had two daughters, co-heiresses Clementia, married to Eudo de Longvillers, and Matilda, married to Geoffrey de Neville ("de Novavilla").

Hunter remarks that "the perplexed genealogy of these two great heiresses has exercised the skill of Dodsworth and innumerable other genealogists." In the Chartulary of Pontefract there is what he calls "a rare specimen of a pedigree prepared at the beginning of the fourteenth century," showing the descent of this family from Adam Fitz-Swein to a Thomas de Burgh then living. It is given in the Monasticon:

"Progenies Suani filii Alurici

"Swayn filius Alrick feovavit domum de Pontefracto et monachos ibidem Deo servientes de ecelesia de Silkeston, cum sex bovatis "terræ in eadem villa.

"Et de dieto Suano venit Adam filius ejus, et confirmavit feofamentum patris sui, scilicet de ecelesia de Silkeston cum sex bovatis terræ.

"Et de dicto Ada venit Matilda et Anabilla, et de Matilda venit Roger de Munbegun, Mabilia et Clementia de Lungvilers, de Clementia venit Johannes de Lungrilers, et de illo Johanne de Lungvilers venit alms Johannes de Lungvilers, et de illo Johaime venit Mahilia at Margareta uxor Galfridi de Neovila et de Mabilia venit Willielmus de Lamare, et de Willielmo de Lamare venit alia Mabilia, et de illa Mabilia venit Hugo de Neovila et de Anabella filia Adae venit Saira et de Sarra venit Thomas de Burgo et de Thoma de Burgo alius Thomas de Burgo et Johannes, et dictus Thomas expiravit sine hærede, et de Johanne venit Thomas de Burgo qui nune est."

The Son of Adam Fitz-Swein's daughter Clementia was John de Longvilliers (esch. 39 Henry III., 1254) whose son Sir John, of Hornby Castle (Lancs.), had an only daughter Margaret, who married a Geoffrey Neville (1268) and took into that family her father's large estates of Hornby Castle, Hutton Longvilliers in Yorkshire, and Appleby in Lincolnshire.

Adam Fitz-Swein's daughter Amabil, who inherited her father's more westward estates, including Cawthorne and its residence, mar-