Now for a look back in time, when DNA was far from being discovered!
https://manuscrits-france-angleterre.org
Some links will go to the British Library in England:
https://www.bl.uk/medieval-english-french-manuscripts
Other links will be from the National French Library (Bibliothèque Nationale de France, BNF) with an English version:
https://gallica.bnf.fr/accueil/en/content/accueil-en
Credit: Image on Bristish Library page https://www.bl.uk/medieval-english-french-manuscripts