The Raab formed the south-eastern border of Thuringia at the time.
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Their real Christianisation took place, alongside the ecclesiastical organisation of their territory, during the early and mid 8th century under Boniface, who felled their "sacred oak" at Geismar in 724, abolishing the vestiges of their paganism.
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By the time of Charles Martel and Saint Boniface, they were again subject to the Franks and ruled by Frankish dukes with their seat at Würzburg in the south.
After Burchard, no further dukes of the Thuringii are recorded, but they remained a distinct people, eventually forming a landgraviate in the High Middle Ages.