 Several of Eadbald 's near relatives were involved in diplomatic marriages . King Anna of East Anglia married his daughter , Seaxburh , to Eorcenberht , and their daughter Eormenhild married Wulfhere of Mercia , one of the most powerful kings of his day . Eanflæd , Eadbald 's niece , married Oswiu , king of Northumbria and the last of the northern Angles Bede listed as holding imperium over southern England . Eadbald 's granddaughter Eafe married Merewalh , king of the Magonsæte . 
