"Isabella who was the wife of Robert Mauduit, who is one of the heirs of Thurstan Basset…" made a fine "for having her rightful portion…of lands formerly of Thurstan her father" in the honour of Wallingford, dated 8 Jan 1223. "Thomas de Venuz" made a fine for marrying "Isabella, who was the wife of Robert Mauduit…if she will consent to this", dated 24 Oct 1225. It is not certain that this second marriage took place as Isabella died soon after the date of the document. "William Mauduit" paid homage to the king for "the lands that Isabella Basset, mother of the said William, whose heir he is, held in chief in his bailiwick", dated 11 Dec 1225. 1
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Honour of Wallingford. To the keeper of the honour of Wallingford. Isabella who was the wife of Robert Mauduit, who is one of the heirs of Thurstan Basset, has made fine with the king by 20 m. to be rendered at two terms, namely 10 m. at Easter in the seventh year and 10 m. at Michaelmas next in the same year, for having the reasonable portion that falls to her of the lands formerly of Thurstan, her father. Robert de Burnebu and Joanna, his wife, sister of Isabella, who is one of the heirs of Thurstan, have made fine with the king by 30 m. and a palfrey, to be rendered at the same terms, for having the reasonable portion that falls to the same Joanna of the lands formerly of Thurstan, her father. Richard Burdun and Egelina, his wife, sister of Isabella, who is one of the heirs of Thurstan, have made fine with the king by 30 m. and a palfrey, to be rendered to the king at the same terms, for having the reasonable portion that falls to the same Egelina of the lands formerly of Thurstan, her father. John le Brun and Alice, his wife, sister of Isabella, who is one of the heirs of Thurstan, have made fine with the king by 30 m. and a palfrey, to be rendered to the king at the same terms, for having the reasonable portion that falls to the same Alice of the lands formerly of Thurstan, her father. Order that, having accepted security from Isabella, Robert and Joanna, Richard and Egelina, John and Alice for rendering the aforesaid fine to the king at the aforesaid terms, he is to cause them to have full seisin without delay of their reasonable portions that fall to Isabella, Joanna, Egelina and Alice of the lands formerly of Thurstan, their father, in his bailiwick. He is to take into the king's hand, and keep safely until the king commands otherwise, the rest of the lands formerly of Thurstan, which fall to Matilda and Laurencia, daughters of Thurstan, who married after Thurstan's death without the assent and will of the king. Witness [Hubert de Burgh, justiciar of England] as above. By the same and the king's council.
Calendar of Fine Rolls, Henry III