I was looking at potential fictional French areas for an Imaginary regiment for my French 7YW army, and came across the Imagi-Nation Poictesme - Wikipedia:
"Poictesme (pronounced "pwa-tem") is a fictional country or province which forms the setting of the fantasy works of James Branch Cabell, known collectively as The Biography of Manuel. Poictesme is ruled by the Count Dom Manuel. It was the author's intention to situate Poictesme roughly in the south of France. The name suggests the two real French cities of Poitiers (medieval Poictiers) and Angoulême (medieval Angoulesme)"
If anyone knows the Drapeau d'Ordonnance of Poictesme I'd be interested :)
Update - have uploaded a drawing of a Drapeau as discussed in the comments