Освиу
Saint Botolph began to build his monastery at Icanho, now conclusively identified as Iken, Suffolk, in the year that Anna was killed, possibly to commemorate the king. Anna was succeeded in turn by his two brothers Æthelhere and Æthelwold, who may have ruled jointly. It is possible that Æthelhere was set up as a puppet ruler by Penda or was his ally, as he was one of the 30 "duces" that accompanied Penda when he attacked Oswiu of Northumbria at an unidentified location called the Winwæd in 655 or 656. Penda himself was killed at the Winwæd, after having steadily increased his power over a period of 13 years. Æthelhere (who was also slain at the Battle of the Winwæd) and Æthelwold were succeeded by the descendants of Anna's youngest brother, Æthelric.