Alice le Rus, widow of Richard Longespee, died shortly before 28 Jan 1300/1, daughter and heir of William le Rus of Stinton, Norfolk by Agatha (dsp shortly before 27 Dec 1261), daughter and heir of Roger de Clere of Brumlegh, Surrey and Ludborough, Lincoln. [Magna Charta Sureties]
Note: I am not sure how to read the above. MCS cannot mean that Agatha "dsp" because in the same statement she is said to have a daughter (Alice) by her husband William le Rus.
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He [Richard de Breuse] married, before 9 September 1265 Alice, widow of Richard LUNGESPEYE (who died s.p. shortly before 27 Dec. 1261, and daughter and heir of William LE Rus, of Stinton, Norfolk, Akenham and Whittingham, Suffolk, by Agatha. daughter and heir of Roger DE CLERE, of Bramley, Surrey, and Ludborough, co. Lincoln. She was born 25 December 1245 or 1247, or 1 January 1245/6. He died before 18 June 1292. His widow died shortly before 28 January 1300/1. They were buried in Woodbridge Priory. [Complete Peerage II:304, (transcribed by Dave Utzinger)]