Isabel Assheton (Kirkby) - No proof of marriage?

De Assheton, Sir John (d. 1427), kt. Elder son of Sir John de Ashton (c.1354-98) and his wife, Joan, the daughter of William Radcliffe of Smithills in Lancashire. He followed his father into service with the House of Lancaster in the 1380s, and was made a Knight of the Bath at the coronation of King Henry IV in 1400. JP for Lancashire from 1404 and MP for Lancashire in 1411, 1413 and 1416. He may have fought against the Welsh and the Scots during Henry IV's reign; he certainly served under King Henry V in 1415 on the Agincourt campaign. In 1417 he returned to France and was appointed seneschal of Bayeux and baillie of the Cotentin in 1418, offices he held until 1421. During those years he was also sent three times on embassy to Brittany. In the 1420s he played less part in public life, but was appointed JP for Yorkshire. He married 1st, Jane, daughter of John Savile of Tankersley (Yorks), by whom he had three sons and eight daughters, and 2nd, Margaret Gray. His issue included:
(1.1) Sir Thomas Assheton (c.1403-60), kt.; knighted by 1434 but was exempted from appointment to Crown offices, 1442; had a licence to practice alchemy, 1446; married Elizabeth, daughter of Sir John Byron and had issue ten children;
(1.2) Lucy Assheton; married 1st, Sir Berton Entwisle, 2nd, Richard Byron, and 3rd Sir Ralph Shirley;
(1.3) Margaret Assheton; married Thomas Langley of Edgecroft;
(1.4) Katherine Assheton; married John Dukinfield;
(1.5) Elizabeth Assheton; married 1st, Sir Ralph Harrington and 2nd, Sir Richard Hammerton;
(1.6) Agnes Assheton; married Thomas Booth of Barton;
(1.7) Anne Assheton; married [forename unknown] Dutton of Cheshire;
(2.1) Sir Ralph Assheton (c.1425-88), kt. (q.v.).
He inherited estates at Ashton-under-Lyne, Wardle and Alt (Lancs) and Morley (Yorks WR); his Lancashire estates were left to his eldest son, but his Yorkshire property to the son of his second marriage.
He died 3 September 1427. His wives dates of death are unknown.

https://landedfamilies.blogspot.com/2016/05/216-assheton-of-downham...

Family and Education of Sir John Assheton, M.P. for Lancashire
b.c.1354, s. and h. of John Assheton (d.c.1360) of Ashton-under-Lyne by his w. Margaret, da. of Robert del Leigh of Adlington, Cheshire. m. (1) by c.1366, Joan, da. of William Radcliffe of Smithills, Lancs., at least 5s. inc. Sir John II*, 1 da.; (2) a da. of Robert Staveley (d. by 1410) of Staveley, Cheshire. Kntd. by 1377.1

https://www.historyofparliamentonline.org/volume/1386-1421/member/a...

https://www.historyofparliamentonline.org/volume/1386-1421/member/k...

https://www.historyofparliamentonline.org/volume/1386-1421/member/a...

I think these sources might help clear it up, but I need to take a break from it and revisit later. If anyone else can see the solution, please be my guest. At this point I suspect a little conflation between the John Asshetons senior and junior.

I'm having trouble pinpointing Sir Roger de Ashton , so far all I find is one born later who was the grandson of Ralph Assheton.

https://en.wikipedia.org/wiki/Richard_Assheton_of_Middleton

https://en.wikipedia.org/wiki/Ralph_de_Ashton

Sir Ralph Ashton, Kt.

I suspect an audit of merges may reveal a faulty one somewhere in the mix, but I'll have to look later.