Jeannette de Gruyère

https://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3D-K.htm#Ka...

GUILLAUME de Grandson, son of PIERRE [II] Seigneur de Grandson & his [second] wife Agnes de Neuchâtel ([after 1250]-27 Jun 1335). Under age in 1263: … m firstly [1275?] Jeannette de Gruyère, daughter of PIERRE [II] Comte de Gruyère & his wife Ambrosie --- (-before 1284)]. … Bearing in mind Guillaume’s likely birth date it is probable that the couple did not marry before [1275]. The possibility of this Grandson/Gruyère marriage seems good, especially as Jeannette’s older brother was already married to Guillaume’s sister.]

Guillaume & his first wife had [two or more] children:

• 1. two or more sons. Their existence is confirmed by the 1306 indult cited above granted to their stepmother to hold services for the souls of “the elder sons of her said husband”. Besides the two possible sons named below, Williams discusses other possible children of Guillaume’s first marriage[491].
• 2. [GERARD de Grandson (-[before 1306]).
• 3. [JOHN de Grandson (-[before 1306]). Williams suggests that Guillaume’s sons by his first marriage (deceased in 1306 as noted above) may have included John de Grandison who is named in the following document[495], although if he is correct Guillaume would have had two sons named John, one from each marriage.
• 4. [AGNES ([1282/83]-Ruskington, Lincolnshire 11 Dec 1357, bur Ruskington All Saints). Williams discusses Agnes wife of Thomas Lord Bardolf as another possible child of Guillaume de Grandson by his first wife[497].

m secondly (1285 or before) SIBYLLA de Tregoz, daughter of JOHN de Tresgoz & his wife Mabel FitzWarin (before 1270-21 Oct 1334, bur Dore Abbey). Guillaume & his second wife had ten children: …

References

1. Foundation for Medieval Genealogy: The First Marriage and Issue of William de Grandison, 1st Lord Grandison (d.1335) < link >