Both Ecgric and Sigeberht were killed in battle in around 636, at an unknown location, when the East Anglians were forced to defend themselves from a Mercian military assault led by their king, Penda.
Ambos os dous Ecgric e Sigeberht morreron en batalla ao redor de 636, nunha localización descoñecida, cando Anglia Oriental se veu forzada a se defender dunha agresión militar Mercia liderada polo seu rei, Penda.