Ecgric's successor, Æthelwold's brother Anna, who was renowned for his devout Christianity and the saintliness of his children, proved ineffective in preventing East Anglia from being invaded by the Mercians. Following a Mercian attack in 651 on the monastery at Cnobheresburg, Anna was exiled by Penda, possibly to the kingdom of the Magonsæte. After his return, East Anglia was attacked again by Penda, Anna's forces were defeated and he was killed. During the reign of his successor, Æthelhere (another brother of Æthelwold), East Anglia was eclipsed by Mercia. In 655, after the Battle of the Winwæd, near Leeds, in which Æthelhere was slain fighting beside Penda, a new political situation arose. Penda's son Peada, who had ruled the Mercian province of the Middle Angles as a Christian king from 653, now succeeded Penda as king of Mercia, but he was murdered a year later. Peada's death dealt a severe blow to Mercian aspirations of dominion over the other kingdoms of England.