Dear Pat ~
The record you just posted makes it likely that Alice, wife of Edward de Saint John, Knt., of Kent (#4) was the widow of Roger Dallingridge, Esq. I happened to research Roger Dallingridge about a month ago and I'm familiar with this man's history.
Available sources indicate that Roger Dallingridge, Esq., married (2nd) before 23 May 1362 Alice de Lisle, widow of Thomas de Seymour, Knt., and that Roger died about 1380. Roger's widow, Alice, was known to have been still alive in 1401. As such, there is ample time for Alice, widow of Roger, to have married (3rd) Edward de Saint John, Knt., who died in or before 1397. And also for her to still be living in 1405.
Here is the glitch, however. Alice de Lisle's 1st husband Thomas was born about 1304, and her 2nd husband Roger was born about 1311. As such, she can't possibly be the mother of your Elizabeth Saint John, who married George Brewes and Thomas Slyfield.
One possible solution (assuming Alice is the mother of your Elizabeth) is that Alice, widow of Roger Dallingridge, Esq., was a much younger last wife of Roger, and that she is a separate and distinct person from his known 2nd wife, Alice de Lisle, who surely was born no later than about 1320.
Or perhaps there were two Roger Dallingridge's, one much older than the other. If so, both men were survived by a widow, Alice.
I've copied below my file account of Roger Dallingridge, Esq., died about 1380. For the time being, I've left it that his known 2nd wife, Alice de Lisle, is the one who survived him and married Edward Saint John, Knt. I've included references to three Common Pleas lawsuits I've found which involve Alice, widow of Sir Edward Saint John, Knt.
Given that your Elizabeth Saint John was born say 1380, it would make sense that if her mother was Alice, widow of Roger Dallingridge, that Alice would have to be a much younger 3rd wife of Roger Dallingridge. But that's only if Sir Edward de Saint John and his wife, Alice, are your Elizabeth Saint John's parents.
Best always, Douglas Richardson, Salt Lake City, Utah
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ALICE DE LISLE, married THOMAS DE SEYMOUR (or SAINT MAUR), Knt., of Rode, Somerset, Newton by the Sea, Northumberland, Worplesdon, Surrey, Eaton Maisey (in Castle Eaton) and Poulton, Wiltshire, etc., son and heir of Nicholas de Seymour (or Saint Maur), Knt., 1st Lord Seymour (or Saint Maur) [see ZOUCHE 11], by his 1st wife, Eve, daughter and heiress of Robert de Meysey. He was born about 1304 (probably aged 12 in 1316). They had no issue. In 1329 he settled the manor of Eaton Maisey (in Castle Eaton), Wiltshire, and the fourth part of the manor of Finedon, Northamptonshire, together with three messuages and lands in Irthlingborough, Northamptonshire on himself and Laurence de Seymour, parson of the church of Higham Ferrers, and the heirs of Thomas. In 1338 he conveyed the reversion of property in Kingston (in Chesterton), Wiltshire to James de Wodestok. In 1345 he leased to William de Coundon the chief messuage of Newton by the Sea, Northumberland and all the demesne lands. In 1347 he conveyed the fourth part of the manor of Finedon, Northamptonshire to Simon Simeon. In 1352 Walter de Pavely, Knt., and Joan his wife, conveyed the manor of Mighendon, Wiltshire to him for 100 marks. The same year he conveyed the manor and township of Newton by the Sea, Northumberland to John Stryvelyn, Knt. In June 1358 he was summoned to a Council to meet at Westminster in July, which he did not live to attend. He founded a chantry at Poulton, Wiltshire, which later developed into a small Gilbertine community. SIR THOMAS DE SEYMOUR died shortly before 13 July 1358. His widow, Alice, married (2nd) before 23 May 1362 (as his 2nd wife) ROGER [DE] DALLINGRIDGE (or DALYNGRUGGE, DALYNGRIGGE, DALINGREGGE, DALYNGREGGE), Esq., of Dallingridge, Sussex, Knight of the Shire for Sussex, 1360, 1362, 1363, and 1376-7, Sheriff of Surrey and Sussex, 1371-2, and, in right of his 1st wife, of Rottingdean and Sheffield (in Fletching), Sussex, son and heir of John de Dalyngridge, of Dallingridge and Bolebrook, Sussex, Laceby, Lincolnshire, etc., by Joan, daughter and heiress of Walter de la Lynde. He was born about 1311. In 1340-1 Richard de Hothleghe the elder granted Roger son of John de Dalinggerugge a release of land, etc., in Hartfield, Sussex. In 1341 John atte Solere, senior sued Roger son and heir of John de Dalyngeregge in the Court of Common Pleas regarding a debt of 20 marks. In 1359 Margaret, widow of Thomas de Shepton, granted him a rent issuing out of Pedelungwerthe, Sussex. In 1362 he made a recognizance to Queen Philippe for 20 marks, to be levied, in default of payment, of his lands and chattels in Sussex. In 1362 John de Worth [see MOWBRAY 8.ii], cousin and heir of Thomas de Seymour, conveyed two parts of the manor of Sheffield (in Fletching), Sussex to Roger Dalyngruge and Alice his wife. In 1374 he was granted free warren in the manor of Sheffield (in Fletching), Sussex. In 1382 Sir John de Worth requested an assize of mort d'ancestor regarding a messuage in St. Peter Bradestrete, London against Richard de Seymour, Knt., John claiming the property as nephew and heir of Thomas de Seymour, Knt. ROGER DALLINGRIDGE, Esq., died about 1380. His widow, Alice, married (3rd) EDWARD DE SAINT JOHN, Knt., of Kent. He died before 1398. In 1398 Alice widow of Edward Seynt Johan, Knt., Thomas Brouneflete, William Wateresfeld chaplain, and Robert Hovell (or Howell), acting as executors of the will of Edward Seynt Johan, Knt., sued Thomas atte Rede and another in the Court of Common Pleas regarding a debt of £39. In 1399 the same parties sued Thomas atte Rede and John Berklegh in the Court of Common Pleas regarding a debt of £20. In 1405 Drew Barentyne sued Alice, widow of Edward Saint John, Knt., administrator of Roger Dalyngrygge, Esq., regarding a debt of 11 marks 6s.; the said Alice replied that she was not the administrator of Roger Dalyngrygge and a jury decided in her favor.
References:
Throsby, Thoroton's Hist. of Nottinghamshire 1 (1790): 34-42. Nicolas, Controversy between Scrope & Grosvenor 2 (1832): 370-372 (biog. of Sir Edward Dalyngrigge). Coll. Top. et Gen. 7 (1841): 157-158 (sub St. Maur). Banks, Baronies in Fee 1 (1844): 405-406 (sub St. Maur). Sussex Arch. Colls. 12 (1860): 221-231; 62 (1921): 64-92 (author states in error that Roger Dalyngruge [died c.1380] was the son of Thomas Dalyngruge). Duckett, "Evidences of Harewood Castle in Yorkshire," Papers Hist. & Antiq. (1880): 25-31. Bateson, Hist. of Northumberland 2 (1895): 84-89. List of Sheriffs for England & Wales (PRO Lists and Indexes 9) (1898): 60. Trans. Bristol & Gloucs. Arch. Soc. 22 (1899): 26-27. C.C.R. 1360-1364 (1909): 52, 397, 404, 439-440, 556-557. Cal. IPM 6 (1910): 16-17; 10 (1921): 345-347. VCH Surrey 3 (1911): 390-395. Clay, Extinct & Dormant Peerages (1913): 125-126 (sub Lisle). Rpt. on the MSS of Reginald Rawdon Hastings, Esq. 1 (Hist. MSS Comm. 78) (1928): 245. VCH Northampton 3 (1930): 207-214. C.P. 8 (1932): 48 (chart), 73 footnote i (sub Lisle) (author states in error Alice de Lisle married (2nd) Robert Peverel); 11 (1949): 359, footnote i (sub Saint Maur). VCH Sussex 7 (1940): 257. VCH Wiltshire 5 (1949): 42-46. Chew, London Possessory Assizes (1965): 46-72 (no. 154). Elrington, Abs. of Feet of Fines Rel. Wiltshire (Wiltshire Rec. Soc. 29) (1974): 100. O'Connor, Cal. Cartularies of John Pyel & Adam Fraunceys (Camden Soc. 5th Ser. 2) (1993): 168-169. Court of Common Pleas, CP40/327, image 32f (available at
http://aalt.law.uh.edu/AALT1/E3/CP40no327/aCP40no327fronts/IMG_0032.htm). Court of Common Pleas, CP40/548, image 116f (available at
http://aalt.law.uh.edu/AALT4/R2/CP40no548/aCP40no548fronts/IMG_0116.htm). Court of Common Pleas, CP40/555, image 29f (available at
http://aalt.law.uh.edu/H4/CP40no555/aCP40no555fronts/IMG_0029.htm). Court of Common Pleas, CP40/555, image 368d (available at
http://aalt.law.uh.edu/H4/CP40no555/bCP40no555dorses/IMG_0368.htm). Court of Common Pleas, CP 40/579, rot. 220d (
http://www.british-history.ac.uk/no-series/common-pleas/1399-1500/michaelmas-term-1405). National Archives, E 326/2889; E 326/8109; E 326/8110; E 326/8111; E 327/701 (available at
http://discovery.nationalarchives.gov.uk). National Archives, CP 25/1/177/78, #334; CP 25/1/181/12, #100; CP 25/1/286/35, #42 [see abstract of fines at
http://www.medievalgenealogy.org.uk/index.html].