| Theobald II | |
| Count of Champagne | |
| Predecessor: | Hugh |
| Noble Family: |
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| Father: | Stephen, Count of Blois |
| Mother: | Adela of Normandy |
| Spouse: | Matilda of Carinthia |
| Issue: | Henry I, Count of Champagne Theobald V, Count of Blois Adela, Queen of France Stephen I of Sancerre William White Hands and others... |
| Successor: | Henry I |
| Birth Date: | 1090 |
Theobald the Great (1090 - 1152) was count of Blois and of Chartres as Theobald IV from 1102 and was Count of Champagne and of Brie as Theobald II from 1125. Theobald held Auxerre, Maligny, Ervy, Troyes and Châteauvillain as fiefs from Odo II, Duke of Burgundy.
Theobald was the son of Count Stephen II of Blois and his wife Adela of Normandy (daughter of William the Conqueror), and the elder brother of King Stephen of England.
Although he was the second son, Theobald was appointed above his older brother William. Theobald accompanied his mother throughout their domain on hundreds of occasions and, after her retirement to Marcigney in 1125, he administered the family properties with great skill. Adela died in her beloved convent on 8 March 1137, the year after her son Stephen was crowned king of England.
King Louis VII of France became involved in a war with Theobald by permitting Count Raoul I of Vermandois, seneschal of France, to repudiate his wife Eleanor, sister of Theobald and of King Stephan, in order to marry Petronilla of Aquitaine, sister of Louis VII's own wife, Eleanor. The war, which lasted two years (1142–1144), was marked by the occupation of Champagne by the royal army and the capture of Vitry-le-François, where 1500 people perished in the deliberate burning of the church by Louis.
The scholastic Pierre Abélard, famous for his love affair with and subsequent marriage to his student Héloïse d'Argenteuil, sought asylum in Champagne during Theobald II's reign. Abelard died at Cluny Abbey in Burgundy, a monastery supported by the Thebaudians for many centuries.
In 1123 he married Matilda, daughter of Duke Engelbert of Carinthia. Their children were:
Theobald had an illegitimate son, Hugh, (d.1171), abbot of Lagny near Paris.