PIERRE [I] de France, son of LOUIS VI King of France & his wife Adélaïde de Maurienne ([1126]-Palestine 10 Mar [1180/10 Apr 1183]). William of Tyre names him as brother of Louis VII King of France, when recording his arrival in Palestine in 1179[1774]. "Petrus Nivernensis comes et Curtiniaci dominus" (the reference to "Nivernensis comes" presumably being an error introduced by a later copyist who confused Pierre [I] with his son Pierre [II]) donated property to the Hospital of St John of Jerusalem by charter dated 1150 "apud Curtiniacum in castro meo"[1775]. He succeeded in 1161 as Seigneur de Courtenay, de Montargis, de Château-Renard, de Champignelles, de Tanlay, de Charny et de Charenton, by right of his wife. The necrology of La Cour-Dieu records the death "VI Id Mar" of "Petrus de Curtiniaco"[1776].
m (before 1150) ELISABETH de Courtenay, daughter and heiress of RENAUD Seigneur de Courtenay & his first wife Helvis de Donjon ([1135/40]-14 Sep after 1205). A Historia Regum Francorum records that "Petrus", son of Louis VI King of France, married "filiam Rainaldi de Curtiniaco cum…terra illius"[1777]. The Chronicle of Alberic de Trois-Fontaines names "domina de Monte-Argisi fuit soror vel neptis illius [=Guilelmus…archiepiscopus Bituricensis]" as the wife of "Petro de Cortenaio regis Philippi patruo", "Monte-Argisi" being identified as "Montargis, département Loiret" by the editor of the MGH edition[1778]. The dating of her marriage is suggested by the charter of her husband "Petrus Nivernensis comes et Curtiniaci dominus" dated 1150 which he signed "apud Curtiniacum in castro meo"[1779]. "Petrus regis frater et Curtiniacensis dominus" donated property to the abbey of Fontaine-Jean by charter dated 1170, with the support of "uxor mea Isabel et primogenitus meus Petrus"[1780]. The necrology of the Eglise Cathédrale de Paris records the death "XVIII Kal Oct" of "Helysabeth mater Petri comitis Autisiodorensis"[1781].
Pierre [I] & his wife had ten children