This episode has moreover been compared with information in the Gesta Caroli Magni of Notker the Stammerer (c. 883), which says that the Danish King Gudfred (d. 810) was slayed on the instigation of his former queen.
This episode has also been compared to information found in the Gesta Caroli Magni by Notker the Stammerer, written around 883 AD, which discusses that Danish King Gudfred (died in 810) was killed at the command of his former queen.