Theutbald I (or Theobald, French: Thibaut, Thibaud, Latin: Theutbaldus; died 16 August 856) was the bishop of Langres from when he was elected to succeed Alberic (died 838) until his death.
[1] He may have belonged to the same Bavarian family that had dominated the episcopate of Langres since 769.
[2] In 841, at the start of open war between the three sons of Emperor Louis the Pious, Thibaut and Count Warin of Langres joined the side of the youngest brother, Charles the Bald.
[4][5] As a result of Warin and Thibaut's support, the county of Langres fell on Charles's side of the border after the Treaty of Verdun (843) ended the war between the brothers.
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