The Historia Comitum Ghisnensium names "Willelmum, Thomam et Eustacium et filias" as the children of "de Fielnis…Engelramnum" and his wife "nobilem de Tingreio Sibillam…". “Willelmus filius Ingelrami dominus de Fielnes” donated property to Andres, with the consent of "uxore mea Agnete et filio meo Ingelramno", by charter dated 1 Jan 1203 witnessed by "Radulfo de Fielnes patruo meo…Joanne de Tingri…". The Testa de Nevill includes a writ of King John dated 1212 which records that "Willelmus de Fienes" held "manerium de Mortok que fuit de dominico regis de dono comitis Willelmi filii Reginaldi filii Stephani qui manerium predictum dedit [Faramo] de Bolonia pro servicio i militis" in Somerset. 2
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3 Jan 1218, Buckinghamshire
William de Fiennes gives the king 200 marks for having seisin of the manor of Wendover with its appurtenances. Order to the sheriff of Buckinghamshire that, having accepted security for rendering those 200 marks to the king, he is to cause him to have full seisin of the manor and appurtenances. Order to William de Cantilupe to cause him to have the manor, having removed his stock and chattels.
30 Aug 1218, Buckinghamshire
Order to the sheriff of Buckinghamshire to cause William de Fiennes to have respite until the octaves of Michaelmas from the demand that he makes from him for the arrears of the fine that he made with the king for his land of Wendover.
Calendar of Fine Rolls, 2 Hen. III, 20, 199
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19 May 1221, Kent
William de Fiennes has made fine with the king by 100 marks for having custody of the lands formerly of Ernald count of Guines for as long as it pleases the king, excepting that land in Bedfordshire which the king committed to his beloved and faithful Henry de Trubleville to sustain him in the king’s service for as long as it pleases the king. Order to cause William to have full seisin without delay.
Calendar of Fine Rolls, 5 Hen. III, 160
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20 Sep 1229
William de Fiennes has made fine with the king by 40 marks, of which he is to render a moiety at Michaelmas in the thirteenth year and the other moiety on the morrow of St. Andrew in the fourteenth year, so that he is not to cross with the king at his first crossing at Michaelmas in 15 days, saving to the same William his scutage from the fees that he holds in chief. Order to the sheriff of Somerset not to distrain him to cross with the king.
Calendar of Fine Rolls, 13 Hen. III, 309
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4 Jul 1234
Order to the barons of the Exchequer to place in respite the demand they make from William de Fiennes by summons of the Exchequer until Michaelmas in the eighteenth year.
22 Oct 1234, Kempton
Order to the barons of the Exchequer to place in respite the demand they make by summons of the Exchequer from William de Fiennes until the octaves of the Close of Easter in the nineteenth year.
Calendar of Fine Rolls, 18 Hen. III, 249, 398
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15 Mar 1236, Barnwell
To the barons of the Exchequer. The king has given respite to William de Fiennes from the debt that he owes him, both for the prest of Ireland and elsewhere, from which the king had previously given him respite until the Close of Easter in the twentieth year, until St. John the Baptist in the same year. Order to cause him to have that respite.
19 Apr 1236, Reading
Order to the barons of the Exchequer to place in respite the demand that they make by summons of the Exchequer from William de Fiennes for several scutages, until 15 days from Michaelmas in the twentieth year.
8 Oct 1236, St. Neots
Order to the barons of the Exchequer to place in respite the demand that they make from William de Fiennes until 15 days from Easter in the twenty-first year.
Calendar of Fine Rolls, 20 Hen. III, 181, 231, 554
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After 16 Oct 1239
Order to the barons of the Exchequer to cause William de Fiennes to have respite from several scutages and prests until 15 days from Easter in the twenty-fourth year.
Calendar of Fine Rolls, 23 Hen. III, 374
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After 12 Jul 1240, Buckinghamshire
The king, upon the death of William de Fiennes, has taken homage from Enguerrand, son and heir of the same William, for the lands that he held of the king in chief. Order to the sheriff of Buckinghamshire to take security for his relief.
Calendar of Fine Rolls, 24 Hen. III, 135
Also called Seigneur Guillaume I DE FIENNES, Baron de Tingry