Portrait traditionally identified as a presumed depiction of <a href="https://en.wikipedia.org/wiki/en:Fran%C3%A7oise-Marguerite_de_S%C3%A9vign%C3%A9" class="extiw" title="w:en:Françoise-Marguerite de Sévigné"><span title="French salonnière and countess">Françoise-Marguerite de Sévigné</span></a> (1646-1705), but it's probably <a href="https://en.wikipedia.org/wiki/en:Marguerite_Louise_d%27Orl%C3%A9ans" class="extiw" title="w:en:Marguerite Louise d'Orléans"><span title="French princess">Marguerite Louise d'Orléans</span></a> (1645-1721)
<ul><li><small>Identification made by <a href="//commons.wikimedia.org/wiki/User:Ecummenic" title="User:Ecummenic">Ecummenic</a> based on the comparison with some portraits of that princess (see images below)</small></li></ul>
<bdi><a href="https://en.wikipedia.org/wiki/en:Nicolas_Mignard" class="extiw" title="w:en:Nicolas Mignard"><span title="French painter (1606-1668)">Nicolas Mignard</span></a>
</bdi>
<span class="int-own-work" lang="en">Own work</span>