Previously, I believed that the parents of 1050811Joan ___ were 2101622Thomas de Dene and 2101623Martha de Shelving. However, researcher Pete Andrews called my attention to 2101622Thomas' inquisitions post mortem, which I had overlooked. 2101622Thomas' two IPM's strongly suggest that he is not 1050811Joan's father (since the IPM explicitly notes 2101622Thomas' daughter Joan as deceased in early childhood, among other incongruences).

Nevertheless, because 1050811Joan certainly seems to be related to 2101622Thomas in some manner, and because my older work could prove useful for future research, I've isolated the profile pages that I'd written for 1050811Joan's formerly proposed ancestors into a separate section of my website, starting from the old version of Joan's page onward.

You can see a list of those ancestors or a family tree of them.
8406494John de Bourne
Key Facts
Parents:unknown
Born:unknown
Died:by July 1325, but may have died long before this date
location unknown
Buried:unknown

On 20 August 1289, 8406494John de Bourne was granted free warren for his lands in [Bishops]bourne, Hegham, and Doddington in Kent.1

He married 8406495Beatrice de Hugham, as explained in her profile.

8406494John's son-in-law 4203246John de Shelving inherited and then sold the Bishopsbourne property by the year 18 Edward II (i.e., July 1324 to July 1325),2 so 8406494John was surely dead by then, although he may well have died years or even decades prior.

Further details about 8406494John are unclear. In C. Moor's book Knights of Edward I, Volume I, on page 126 he writes (abbreviations):

Bourne, Sr John de, Kt. (Burne, Borne). Erm. Ona bend az. 3 lions rampant or (Dering). Made a Custos of St. Augustine’s Abbey, Canterbury, in vacancy, 20 Jy. 1283. Custos of Dover 28 Oct. and of St. Martin’s Priory there 17 Dec. 1283 (F.R.). Comr in Suss. 1284 (P.R.). To pay 100 m. p. a. for Port of Dover 18 May 1285 (C.R.). Goes over seas for K. 1286 (P.R.). Grant of free warren at Bourne, Hegham, and Dudington, Kent, 20 Aug. 1289 (Cart.R.). Late Mayor of Bordeaux. K. gives him 200 pounds Bordeaux 31 Aug. 1289 (P.R.). Owes £40 in Kent 21 Nov. 1289, and £10 there 1290 and 1292 (C.R. and Inq.). Going for K. to Court of Rome 22 June 1290 (P.R.). Justice in Kent 5 Oct. 1295 (Inq.). Sumr to Council at Rochester 8 Sep. 1297 (P.W.). Comr in Bucks., Beds., Oxon., and Leic., 4 Ap. 1298 (C.R.), and Hants. 1316 (Inq.). Kt. Comr re death of Hamon le Bret 3 Nov. 1300 (Inq.). Of Langeford. He and w. Isabel gain suit 6 Oct. 1308 (C.R.). K. sends him to Gascony 16 June 1306 (C.R.). Of Kent. He and w. Margaret have pardon re Thos., E. of Lancaster, 1324. To serve in Guienne 1325 (P.W.). Sheriff of Kent 12 Jan. to 5 Dec. 1330 (F.R.).

Commenting on the above description, in Walter Goodwin Davis' book The Ancestry of Mary Isaac, 1549-1613 on page 132 he writes:

In Knights of Edward I it is obvious that the activities of two John de Bournes, one or both knights, are credited to one individual. Further study might serve to separate them. It is probable that the man who was active between 1283 and 1300 was Beatrice's husband—custos of St. Augustine's Abbey, of Dover and of St Martin's Priory in Dover in 1283; over seas in the king's service in 1286, he was late mayor of Bordeaux in 1289 when the king gave him £200 at the court of Rome for the king in 1290; summoned to the Council at Rochester in 1295. Beatrice de Bourne died before 1317. The Bourne arms were: Argent, on a bend azure three lions passant or.

Sources Cited:

1: Calendar of the Charter Rolls Preserved in the Public Record Office, Volume II: Henry III - Edward I, A.D. 1257-1300 (London, 1906), 389

2: Calendar of Inquisitions Post Mortem and Other Analogous Documents, Volume VII, Edward III (1909), page 212, entry #292. The writ was issued on 6 February 1329/30.