 Until recently no coins from Eardwulf's reign were known, which suggested that it may have been a time of instability, or perhaps that the kingdom was impoverished by the payment of tribute to Offa and Coenwulf of Mercia.It is now known that the issue of new coins continued during Eardwulf's reign, as two of his coins were identified in the 1990s.Issues of new currency appear to have been limited under Eardwulf, and significant numbers of Northumbrian coins are not again attested until the reign of Eardwulf's son Eanred.