Blood court at Cannstatt
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The blood court at Cannstatt (Blutgericht zu Cannstatt) took place as Carloman in 746 invited all nobles of the Alamanni, to a council at Cannstatt. According to the annals of Metz, the annales Petaviani and an account by Childebrand, Carloman arrested several thousand noblemen and executed them for high treason. This ended the independence of the duchy of Alemannia, which after this event was ruled by Frankish dukes.