Thierry IV or Theoderic IV (c. 720 – c. 782) was a Frankish noble. Count of Autun and Toulouse; he was thought to be a son of Sigebert V, and grandson of Sigebert IV of Raze. It is now well documented that it supposed Davidic blood was a hoax (see Priory of Sion). Thierry married Auda, daughter of Charles Martel, sister of Pepin III.
- William of Gellone (755 – 28 May 812/4)
- Alda of Gellone (born ca. 770); married Fredalon
- Adalhelm of Autun
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