PIERRE de Courtenay, son of PIERRE de France Seigneur de Courtenay & his wife Elisabeth de Courtenay Dame de Courtenay ([1155]-Epirus after Jun 1219). The Chronicle of Alberic de Trois-Fontaines names "comitem Petrum Autissiodorensem et Robertum de Cortenaio et quondam Guillemum" as sons of "Petro de Cortenaio regis Philippi patruo" & his wife[25]. He succeeded his father in 1183 as Seigneur de Courtenay. He succeeded as Comte de Nevers et d'Auxerre in 1184, by right of his first wife. He accompanied Philippe II King of France on the Third Crusade in 1190, returning to France in 1193. After his defeat by Hervé de Donzy, following their dispute over the château de Gien, Pierre de Courtenay was confirmed as Comte d'Auxerre et de Tonnerre for life in 1199 but was obliged to cede the county of Nevers, as well as his daughter's hand in marriage, to Hervé. Comte Pierre took part in the crusade against the Albigeois in 1210 and was present at the siege of Toulouse. He fought at the battle of Bouvines in 1214[26]. He succeeded as Marquis de Namur in 1213, by right of his second wife. He was elected in 1216 to succeed his brother-in-law Henri de Flandres as PIERRE I Emperor of Constantinople. Leaving France, he travelled to Rome where he was crowned 9 Apr 1217 by Pope Honorius III at the Church of San Lorenzo fuori i Muri[27]. He sent his wife and daughters directly to Constantinople, but the Venetians persuaded Emperor Pierre to help recapture Durazzo on his way. After succeeding in this enterprise, he was captured in the Albanian mountains by Theodoros Angelos Lord of Epirus, and disappeared[28] presumably murdered although his fate did not become known until [early 1221][29]. The Chronicle of Alberic de Trois-Fontaines records that "Namucensis comes Petrus" was captured by "duce Durachis Theodoro" in 1217[30].
m firstly (1184) AGNES Ctss de Nevers, d'Auxerre et de Tonnerre, daughter of GUY [I] Comte de Nevers, d'Auxerre et de Tonnerre & his wife Mathilde de Bourgogne Dame de Montpensier [Capet] ([1170]-[Mailly] 2 or 6 Feb 1193). The Chronologia Roberti Altissiodorenses records that "Philippus Rex" arranged the marriage of "Guidonis Comitis filiam" and "Petro patrueli suo", and installed him as Comte de Nevers[31]. "Petrus comes Nivernensis et Agnes comitissa uxor eiusdem comitis et filia Guidonis comitis" confirmed the privileges of the church of St Etienne, Nevers by charter dated 1185 which refers to but does not name "filiam nostram"[32]. She and her husband bought Tonnerre from her mother in 1191[33]. "Petrus comes Nivernensis et Agnes comitissa uxor eius" agreed to renounce rights previously held by their predecessors, naming "Willelmus comes sepultus in ecclesia sancti Germani Autissiodonrensis…et filius eius Villelmus qui in Bethleem requiescit", in favour of Saint-Cyr by charter dated 10 Jun 1190[34]. The Chronicle of Alberic de Trois-Fontaines names "Agnes…unica filia comitis Guidonis Nivernensis" as first wife of "comitis Petris"[35].
m secondly (contract 24 Jul 1193, Soissons 1 Jul 1193) YOLANDE de Flandre, daughter of BAUDOUIN VIII Count of Flanders [BAUDOUIN V Comte de Hainaut] & his wife Marguerite Ctss of Flanders ([1175]-Constantinople 24 or 26 Aug 1219). The Chronicle of Alberic de Trois-Fontaines in 1191 names "Elizabeth Francie reginam…Hyolenz uxorem Petri Autisiodorensis et Sibiliam domnam Bellioci uxorem Wichardi" as the three daughters of "Balduinus [Haynaco]"[36]. In a later passage, the same source names "Hyolenz…soror comitis Philippi Namucensis" as wife of "comes Petrus Autisiodorensis", specifying that her husband became Comte de Namur by right of his wife[37]. The Historia Episcoporum Autissiodorensium records that Pierre married "Yolandam sororem Henrici Constantinopolitani Imperatoris" as his second wife after the death of "Agnete uxore sua"[38]. She succeeded as Marquise de Namur in 1213. She was crowned empress of Constantinople with her husband by the Pope 9 Apr 1217 at Rome[39]. She was appointed regent of the Latin empire of Constantinople after arriving safely at Constantinople by sea in 1217, in the absence of her husband whose fate at that time was unknown. She was able to stop the attacks of Theodoros Emperor in Nikaia, and arranged his marriage to her daughter Marie to seal the peace which was agreed