https://en.wikipedia.org/wiki/William_Montagu,_2nd_Baron_Montagu seems to have good citations.
1.) Elizabeth his wife is stated as being the daughter of Peter de Montfort who is SON of Peter de Montfort of Beaudesert Castle;
Are all the children correct?
Private User has brought to attention.
I do see children missing
In reward for his services, in August 1316 he was granted the marriage of the king's ward Joan de Verdun, daughter and heiress of Theobald de Verdun,[7] whom he married-off the following year to his younger son, John Montagu (d. August 1317).[7][5]
7. Cokayne 1936, p. 81.
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IPM is here
Citation:
J E E S Sharp and A E Stamp, 'Inquisitions Post Mortem, Edward II, File 65', in Calendar of Inquisitions Post Mortem: Volume 6, Edward II (London, 1910), pp. 139-149. British History Online http://www.british-history.ac.uk/inquis-post-mortem/vol6/pp139-149 [accessed 14 April 2018].
Terry Jackson (Switzer) you curate his wife, Elizabeth de Montfort
Not only is she missing children, she's missing a husband.
https://en.wikipedia.org/wiki/Elizabeth_de_Montfort
How would you like to approach this?
Found Elizabeth’s husband Sir Thomas III de Furnival, 1st Lord de Furnival and her son John Montagu
Still more children to be located or profiles created. I will wait now on Terry’s feedback.
https://en.wikipedia.org/wiki/Elizabeth_de_Montfort has
Katherine Montagu, who married Sir William Carrington.
17. Katherine is not mentioned in the St Frideswide cartulary.
She should NOT be in this tree, she's part of the Great Carrington Imposture
See https://www.wikitree.com/wiki/De_Montagu-49
(even if there was a Carrington / Montagu marriage in truth, it's a later generation)
Thanks Erica and sorry for not responding sooner. I have started looking at this and find that Wikipedia is not altogether correct in what it says. I was alerted because the dates don't match if she had children with her second husband. Checked with Medlands and sure enough she had 10 children with Montagu. I will try to continue when I can... life is busy at the mo.