Offa minted pennies in East Anglia in the early 790s, so it is likely that Æthelberht rebelled against Offa and was beheaded as a result.
Offa mencetak penny di Anglia Timur di awal tahun 790-an, sehingga kemungkinan bahwa Æthelberht memberontak terhadap Offa dan dieksekusi sebagai hasilnya.