The following are quotes from a couple more sources which further illustrate the Ferrers-Ferris family connections to St. Albans.
The first article suggests the existence of a previously unknown Thomas Ferrers who married a daughter of William Westby living in St. Albans around 1493. It also mentions a John Ferrers as Bailiff of the Liberty in Flamstead between 1494 and 1505. This John was admitted to the “Fraternity of the Monastary” at the petition of John Benstede (probably the father of Catherine Bensted who married John Ferrers, son of Edmund Ferrers who was a son of John Ferrers and Agatha Brekespear.)
The article also mentions a Ralph Ferrers who had a Doctor of Laws in 1475. This Ralph Ferrrers could have been the Ralph noted as a son of Thomas Ferrers (1422-1498) Lord of Tamworth who was married to Anne Hastings. In his "History of the Town and Castle of Tamworth," Palmer (at p. 363 et seq) notes that this Ralph Ferrers became "dean of the church."
https://archive.org/details/historytownandc00palmgoog
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From “Ancient Tomb with Effigies – S. Leonard's Church, Flamstead,” Rev. Fowler, S. Alban's Architectural & Archaeological Society, (1887)
http://www.stalbanshistory.org/documents/1887.09a_jl_.pdf
p. 86
... the connection of the family of Ferrars (or Ferrers) with Flamstead. Thomas de Beauchamp's Countess was Margaret de Ferrars. The name of her father, William de Ferrars, lord of Groby, was enrolled in the Obituary record of S. Alban's Abbey, at her request in 1382, (Lib. Ben. fol. 132). Some of her kindred were resident in S. Albans about the year 1400, or earlier... [W]e learn that John Ferrers, esquire, of S. Albans, had been Seneschal to Henry de Beauchamp, Duke of Warwick, (grandson of Thomas de Beauchamp), who died in 1445.* This John Ferrers married a daughter of Adrian Brekespere, of Langley, and possessed land in the parish of S. Peter, S. Albans. In 1455 he was appointed by Abbot John Wheathampstead his attorney in a certain law suit. (Regist. I. 207). As Seneschal he doubtless managed the manor of Flamstead for the Duke.
p. 87
In 1475, Ralph Ferrers, Doctor of Laws, was appointed Warden of the Hospital of S. Julian, S. Albans—(Regist. II . 120). In 1493, Thomas Ferrers, esquire, was Bailiff of the town of S. Albans: he married a daughter of William Westby, Hundreder of the Liberty, a person of considerable importance. (Lib. Ben. fol. 79). Another John Ferrers, esquire, was Bailiff of the Liberty some time between 1494 and 1505: he was admitted to the Fraternity of the Monastery at the petition of John Benestede, Prior of Tynemouth, brother of his wife Katherine, (fol. 117). In 1549 the manor of Flamstead, (which had come to the crown), was granted by Edward VI. to George Ferrers, of Markyate, son of Thomas Ferrers of S. Albans. He was buried in this church, 11th January, 1578. His son, Julius Ferrers, who succeeded to the manor, was also buried here, (30 Dec. 1596).—[see Cussans, vol. I I , Hund. of Hertford, p. 143]. The name of Thomas de Beauchamp's Steward, is not to be found in the S. Alban's documents, but it is by no means improbable that he was a Ferrers, obtaining the appointment through the influence of the Countess of Warwick, (Margaret de Ferrers), his kins-woman. Possibly he may be the person who gave the glass in S. Peter's church.
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From "The Historical Antiquities of Hertfordshire,” Vol. I, Henry Chauncy, (1826)
https://books.google.com/books?id=3FUPAAAAYAAJ&pg=PA33&lpg=...
p. 32-33
A list of “all those Gentlemen... resided in this County, in the time of Henry VI [b.1421; r. 1422-1461], which I collected from the Original Roll...”
Of the Hundred of Caisho [includes Abbots Langley, 3-4 miles southwest of St. Albans. Flamstead is 4-5 miles northwest of St. Albans.]
…
William Westby of St. Albans, Esq.
John Ferrers of St. Albans, Gent.
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From “St. Peter's Church, St. Albans,” S. Alban's and Herts. Architectural & Archaeological Society, W. Carey Morgan (1897-98),
http://www.stalbanshistory.org/documents/1897_1898_05_.pdf
p. 138-39
As regards Cornwall's Chapel, … Edward Westby (no doubt the same Edward Westby who gave shelter in his house* to King Henry VI. at the time of the second battle of St. Albans), in 1471 gave a legacy to the lights of the Holy Cross, and Edward Bensted two years later gave a legacy for the repairs of the Chapel of the Holy Cross of Cornwaylle" as well as to the Chapel of the Charnel...
p. 144
This is heraldic. The horseshoe border denotes, I believe, that the glass was given by a person bearing the surname of Ferrers. A family of that name possessed land in the parish at an early period. The Book of Benefactors of the Abbey records that John Ferrers, seneschal to Henry, Earl of Warwick, was admitted to the fraternity, and gave 10s. of annual rent, arising out of four tofts, situate in New-lane, in St. Peter's parish. The entry, however, is undated. His wife, Agatha, was a daughter of Adrian Brekespere, of Langley. In 1487, William Victor, by his will directs that his body be buried in St. Peter's Church before St. Christopher, near the grave of Edward Ferrers, his wife's brother, and a Thomas Ferrers, bailiff of St. Albans, was admitted to the monastic fraternity in 1493.