Another source for Henry de Vere who held Mutford: Copinger's Manors of Suffolk, Vil. V, pp. 86 and 89, viewable on Internet Archive at
https://archive.org/details/manorsofsuffolkn05copiuoft/page/n5/mode/2up?q=vere. To save others looking this up,
- p. 86 says of Mutford, Suffolk, "Henry de Vere, who possessed the other moiety of this manor, [footnote: T. de N. 300] left an only son, Henry de Vere, who died without issue, so that having no heirs his share also fell to the Crown.
- p. 89 says of the manor of Soca Luvel, "On the Close Rolls in 1206 we find an order to let Stephen de Longo Campo have land which belonged to Reginald de Bosco in Mutford, unless its value were more than £12 [footnote: Close Rolls, 6 John, 16, 167]: and also an order to give seisin for the King of lands in Mutford which belonged to Henry de Vere, and which had been delivered to Stephen de Longo Campo, and deliver same to Peter de Stoke. [footnote: ib. 13] Three years later on the same Rolls we find an order to restore to Stephen de Longo Campo lands in Mutford, if any, which had been seised and held by him in right of his wife. [footnote: Close Rolls, 6 John, 16, II ; 9 John, 12] There is also an order on the Close Rolls in 1209 to let R., the son of Roger, have lands which belonged to Henry de Vere in this place. [footnote: Close Rolls, 9 John, 17]"
Stephen de Longchamp's wife was Matilda de Cailly's sister Alice.
To sum up the discussion so far on the original question, there seem to be two possibilities:
1.There were two different Henry de Veres, one who married Matilda de Cailly and the other who was ancestor of the de Veres of Drayton and who may have married a Hildeburga (or variant spellings thereof)
2. Henry de Vere had two wives, as shown in some sources, one possibly named Hildeburga, and the other Matilda de Cailly