Pierre Miget or Muguet, also named de Glenesiis, Migecii, Benedictine, doctor of theology, was prior of Longueville-Giffard.

Licentiate at Paris in 1413, he contested with Jean Bouesgue in 1416, before the Parlement on the subject of the priory of Gournay. Although master regent in theology, Pierre Miget resided constantly at Rouen, in the hôtel de Longueville, situated before the gates of the archbishop's palace.

In 1420 he obtained from King Henry V the restitution of the revenues of his benefice and he seems to have been strongly linked to Beaupère who entrusted to him the administration of his diocese in 1434.

With this latter, also, he is to be found at Paris among the masters of the Faculty of Theology from 1421 on. There he must have known Erard Emengart, Nicolas Midi, Pierre de Houdenc, Martin Billorin, Pierre de Dyerée, Jean de Troyes, his confrères, who were all assessors at Jeanne's trial.

Pierre Miget was very assiduous in the matter of the Trial, and he was in no way favorable to the accused. (In 1414 at the Council of Paris he showed himself as a zealous Burgundian and sustained the propositions of Jean Petit.)

He testified as a witness at the Rehabilitation in 1452: but he declared that he wept at Jeanne's death, of which he had been, however, one of the promoters. He testified that the sentence rendered against the Maid was unjust. In summary, he seriously accused the Bishop of Beauvais, whose accomplice he had been.