The extreme length of Æthelberht's reign also has been regarded with skepticism by historians; it has been suggested that he died in the fifty-sixth year of his life, rather than the fifty-sixth year of his reign.
A gran duración do reinado de Aethelberht tamén foi vista con escepticismo polos historiadores; suxeriuse que morreu cando tiña cincuenta e seis anos de idade, e non cincuenta e seis anos de reinado.