This excellent EADT article suggests that a horde found near Tamworth about ten years ago included some crown jewels worn by Anna* or Onna, the (Wuffing) King of East Anglia and nephew of Raedwald. He is likely to have died in a 653/4 battle near Blythburgh, along with his Bishop, Thomas, fighting against Penda’s pagan Mercians. Tamworth is, of course, in Mercia and parts of the treasure can be seen there: in the Birmingham Museum and Art Gallery as well as the Potteries Museum and Art Gallery, Stoke-on-Trent. All five of Anna’s children, including Ethelreda (Audrey) and Jurmin, his only son who died in the same battle.
* Male, despite his name, as were the C16 French warrior Anne de Montmorency and the historian Sharon Turner.