The Annales Cambriæ record that "Ricardus de Clare" married "M filiam J de Laci comitis Lincolniæ" in 1238. The Annals of Tewkesbury record the marriage “circa Purificationem beatæ Virginis” of “filia comitis Lincolniæ” and “Ricardo de Clare”. The Annales Londonienses record the marriage in 1238 of "Ricardum de Clare filium comitis Gloverniæ" and "Matildæ filiæ comitis Lincolniæ". The Chronica de Fundatoribus et Fundatione of Tewkesbury Abbey records the marriage of “Ricardus de Clare secundus filius et hæres…Gilberti et Isabellæ” and “Matildem…filiam comitis Lincolniæ”. 1
  
  
  
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  Transcript of writ to the barons of the exchequer, 4 Feb., 47 Hen. III. [1262/3], to cause M[aud] countess of Gloucester to receive £33 20d., which the king has assigned to her in dower, out of the issues of the earldom of Hertford, late of Richard de Clare, her husband. 2
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  8 Jul 1263, Westminster
  Grant to William de Valencia the king's brother, in part payment of the king's debts to him, that he may keep for himself, out of the 
    fruits of this instant autumn of the lands late of R. de Clare, earl of 
    Gloucester, which the king caused to be cultivated at his own expense, 
    and likewise out of the issues of the manors of Rotherfeud, Blescingleve, 
    Berdefeud, Subiry, Desening, Lakinkchithe, Walsingham, Welles, 
    Warham, Wiston and Bissele arising on this side of St. Giles, £500 
    by reasonable appraisement, saving to the king the residue of the said 
    fruits, and to Maud late the wife of the said earl the fruits in the 
    manors of Deseninge, Walsingham, Welles and Warham, which she 
    caused to be cultivated at her own cost, before the assignment of her 
    dower. And if it happen that Gilbert de Clare, son and heir of the 
    said earl, should not prove his age at the feast of St. Giles, whereby 
    the wardship of his inheritance should belong to the king for the following year, the king grants to the said William that land to the value 
    of £500 a year in the first mentioned manors remain to him for 
    another year from St. Giles if the king owe him so much, and if the 
    king be not bound to him in so much, the excess shall remain to the 
    king. And if the said fruits and issues and any part thereof by reason 
    of the disturbance of the realm, be devastated or carried away so that 
    he cannot collect and have them, the king wills that such default 
    be allowed in his debt...
  Calendar of the Patent Rolls, Hen. III, vol. 5, p. 268
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  1 Sep 1266, Kenilworth
  Protection and safe conduct until Easter for Maud de Clare, countess 
    of Gloucester and Hertford, coming to court.
  Calendar of the Patent Rolls, Hen. III, vol. 5, p. 634
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  25 Feb 1267, Cambridge
  Safe conduct until Michaelmas for Maud de Clare, countess of 
    Gloucester and Hertford, coming to the king's court for her affairs.
  26 Mar 1267, Cambridge
  Although Gilbert de Clare, earl of Gloucester and Hertford, lately 
    impleaded Maud his mother before the king touching the castle of 
    Uske and certain lands in the March where the king's writs do not 
    run ; the king is unwilling that this be drawn into a precedent to 
    the prejudice of the earl or his heirs with respect to their liberties 
    there.
  Calendar of the Patent Rolls, Hen. III, vol. 6, pp. 41, 49
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  20 Aug 1285, Clarendon
  Association of Hamo Hauteyn with R. Boyl[and] in a ... commission [of oyer and terminer], touching the persons who broke the park of Matilda de Clare, countess of Gloucester and Hertford, at Hoveden, co. Suffolk, hunted therein and carried away deer.
  Calendar of the Patent Rolls, Edw. I, vol. 2, p. 211
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  26 Sep 1287, Westminster
  [Letters for] Matilda de Clare, countess of Gloucester, staying in England, nominating William de Inchynghefeld and Thomas Dunfert [her attorneys] for two years.
  Calendar of the Patent Rolls, Edw. I, vol. 2, p. 277
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  10 Mar 1289, Westminster
  [To Master Henry de Bray, escheator this side Trent.] Order to deliver to G. de Clare, earl of Gloucester and Hertford all the lands he took into the king's hands by reason of the death of Maud, countess of Gloucester, of the lands that she held in dower of the earl's inheritance, together with the goods and chattels that he took into the king's hands of the goods and chattels found in the lands or of the issues of the same until a month from Easter next....
  Calendar of the Close Rolls, Edw. I, vol. 3, p. 6