Guy Autret de Missirien, Lord of Missirien, Lesergué, Kergoz, etc., was a French historian and genealogist born around 1599 in Goulien and died in Paris on 3 April 1660.
In 1655 he edited a Vie de saint Joachim today lost.
However, this "Histoire généalogique de Bretagne" was unfinished at his death.
He re-edited and augmented the Vie des Saints de la Bretagne by Albert Le Grand, in 1659.
His correspondence with Pierre d'Hozier was published in 1899 by the Comte de Rosmorduc.