Definitely (early?) 18th century writing, probably paper too. If you have it, check for a watermark and you can find out who made it (in that era in France it'd quite possibly be a Dutchman) Anyway, the more important stamp here is the one at the top "G. DE LION" is for the Généralité de Lyon - this is a notarized document, so it's not a personal letter but a bill of sale or something.

Anyway, I have to go to bed and don't have time to do the whole thing, but it starts with: (accents/cedillas added)

Pierre Demasso Chevalier

seigneur de la fe[r]rier de Lissieu du Plantin

Cap[itai]ne de cavalerie au régiment de Villeroy

sénéchal de Lion et De la province de Lionna[is]

sçavoir faisons qui pardevant le No[tai]re royal

souss[ign]é et les tesmoins et après nommés sero

[??] Jean-Bap[tis]te Rochon, vigneron ha..

It's just formalia up tot his point though, still not quite sure what they're attesting.

I believe that it actually says November 23, 1700 (the 7 is just a bit wonky). You're right that this script is way too late for 1500.

The comment below is also right that this isn't a letter--this is a notarized document--a quittance specifically--that acknowledges receipt of payment of a donation mentioned in Jean-Baptiste Rochon's marriage contract from Estienne Rochon:

Rochon "recognu avoir recu compte et ? en ? ayans courus d'Estienne Rochon, m. [jardinier] ?? en France Lionnais [don?] de Louis Rochon et Marie Goy ses pere et mere cy present la somme de cent quarante livres savoir cent dix livres pour payement et ? de pareille somme par ses pere et mere aud confessant par la donation porté par le contract de mariage entre led Rochon et [Amilee?] [Mallat?] sa femme par acte recu par deffunct M. De [Livais?] notaire royale..."

What that actually means I'm not entirely sure, as I don't normally work with these kinds of notarial documents.