Anna of East Anglia died in 653.
Rædwald of East Anglia died in 624.
Ealdwulf of East Anglia died in 713.
Ecgric of East Anglia died in 636.
Ælfwald of East Anglia died in 749.
Wuffa of East Anglia died in 578.
Æthelweard of East Anglia died in 854.
Sigeberht of East Anglia died in 634.
Eorpwald of East Anglia died in 627.
Æthelhere of East Anglia died on 655-11-15.
Æthelberht II of East Anglia died on 794-05-20.
King Anna (also spelt Onna) was the King of East Anglia between 636 and his death, which is believed to have been in 653 or 654 AD. At the time, Anna was not considered to typically be a female name.
Hertfordshire is not in East Anglia.