Pierre I d'Orgemont (c1315 – 23 June 1389) was the chancellor of France, 1373-1381, lord of Chantilly, 1386-1389, and oversaw the creation of the Chronique des règnes de Jean II et de Charles V, a vernacular continuation of the Roman des rois written by Primat in 1276 and continued by Richard Lescot around 1356.
Orgemont began his career as a lawyer in the parlement of Paris around 1340. He became master clerk in 1347 and first president in 1355, just before the events of the Jacquerie and Étienne Marcel's revolt. Because of his management of the affair, he became a close advisor of King Charles V. In November 1373, Orgemont became the first and only elected chancellor of France, chosen by a council of the king. When Charles died, Orgemont executed the late king's will. He served in parlement as master of requests until 1382 when he was appointed chancellor of Dauphiné on behalf of Charles VI. He purchased the lordship of Chantilly in May 1386, which he passed to his son Amaury upon his death.
Around 1375, Orgemont oversaw the writing of a new redaction of the vernacular Chroniques des Saint-Denis which would bring the chronicle up to date. Orgemont used Primat's chronicle as the source for the original material to 1223, as well as Primat's Vie de Saint-Louis for the years 1226 to 1270, and he used Richard Lescot's continuation for everything else from 1223 to 1350. From that point, Orgemont created his own continuation using primarily knowledge gained from his role as president of the parlement. He continued the chronicle again in 1379 to reflect Emperor Karl IV's visit to France and likely continued writing his continuation until 1382, although the formal manuscript ends rather suddenly in 1379 prior to Charles V's death the next year. The remaining three years of text (with an additional two years written by an anonymous continuator) were only included in an unillustrated manuscript held at the Abbey of Saint-Germain.
- Mirot, Léon. Les d’Orgemont, leur origine, leur fortune, le boiteux d’Orgemont. Paris: Champion, 1913.