He succeeded his father in 1201 as Thibaut IV Comte de Champagne et de Brie. The Chronicle of Alberic de Trois-Fontaines records that "comes Campaniensis Theobaldus" joined his [maternal] uncle in Navarre in 1225.
He succeeded his maternal uncle in 1234 as TEOBALDO I "le Grand" King of Navarre.
He answered the call of Pope Gregory IX for a Crusade in 1239, and led a French contingent which landed at Acre 1 Sep 1239. He marched south to attack the Egyptian outposts of Ascalon and Gaza, where they were defeated. He returned to Europe in Sep 1240.
The necrology of Sens cathedral records the death "Kal Mai" of "Theobaldus illustris rex Navarre et comes Campanie". The necrology of Saint-Etienne, Troyes records the death "11 Jul" of "Theobaldus rex Navarre, Campanie et Brie comes palatinus". The "Corónicas" Navarras record the death "Id Iul…apud Pampilonam" in 1253 of "Teobaldus…rex Navarre et comes palatinus Campanie atque Brie" and his burial in Pamplona. 1
Thibaut married Gertrud VON DAGSBURG, daughter of Albert II VON DAGSBURG Count of Dagsburg and Gertrud VON BADEN, about 15 May 1220. (Gertrud VON DAGSBURG was born between May 1206 and Jun 1206 and died before 19 Mar 1225.
Thibaut also married Agnès DE BEAUJEU, daughter of Guichard IV "le Grand" DE BEAUJEU and Sibylle DE HAINAUT, in 1222. (Agnès DE BEAUJEU died on 11 Jul 1231.
Thibaut also married Marguerite DE BOURBON Queen of Navarre, daughter of Archembaud VIII "le Grand" DE DAMPIERRE and Béatrice DE MONTLUÇON, on 22 Sep 1232. (Marguerite DE BOURBON Queen of Navarre was born in 1211 and died on 12 Apr 1256 in Provins, Brie, France.)