Much of this information was borrowed from Amatus by Peter the Deacon for his continuation of the Chronicon Monasterii Casinensis of Leo of Ostia, written during the early 12th century.
Mange af oplysningerne om traditionen blev genbrugt af Peter (the Deacon) i hans fortsættelse af Leo af Ostias Chronicon Monasterii Casinensis, skrevet i begyndelsen af det 12. århundrede.