796. On Offa's death, East Anglia becomes independent
Eadwald succeeds to East Anglia
The independence of East Anglia can be deduced from the fact that East Anglian moneyers start minting coins in the name of Eadwald after Offa's death (see Grierson and Blackburn, p.293). This coinage is the only evidence of East Anglia's independence, and since the coin types cannot be precisely dated it is impossible to say when Eadwald's reign ended and Coenwulf's reign in Mercia began (two East Anglian moneyers struck coins for Offa, Eadwald, and Coenwulf in turn). Grierson and Blackburn note that the first East Anglian type of Coenwulf features a bust of Coenwulf which probably makes it later than c.805 (when the portrait type was introduced at Canterbury), but caution that since late 8th-century East Anglian coins are so rare, there may have been an earlier East Anglian issue of Coenwulf which has not survived.
P. Grierson and M. Blackburn, Medieval European Coinage, 1: The Early Middle Ages (5th-10th centuries) (Cambridge: 1986)