Je vous propose aujourd'hui encore une nouvelle source de notation mensurale sans doute du XVème siècle en essai de plume dans un manuscrit de de l'abbaye Saint-Bertin de Saint-Omer conservé à Boulogne-sur-Mer, on peu lire en dessous : Ave Maria gr[atia].
Boulogne-sur-Mer, BM, 0071, t. II, 259v
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Wonderful. The chant on the bottom part is a Sanctus (without the Osanna ut supra) -- GS 16* found throughout Old Hall -- but that doesn't mean it's English; just that that's the first source I could find it in. But also not in Graduale Romanum.
The top part has no concordances that I know of. The top voice does not easily go with the bottom part (I could force it, but I don't think it is designed to go together).
Thank you for another great discovery Dominique!