A Fen is the local term for an individual area of marshland or former marshland and also designates the type of marsh typical of the area.
Fenland primarily lies around the coast of the Wash, it reaches into four counties: Lincolnshire, Cambridgeshire, Norfolk and a small area of Suffolk, as well as the historic county of Huntingdonshire. In whole, it occupies an area of nearly 1,500 sq mi (3,900 km2).
Anna or Onna, was king of East Anglia from the early 640s until his death. He was a member of the Wuffingas family, the ruling dynasty of the East Angles. He was one of the three sons of Eni who ruled the kingdom of East Anglia succeeding some time after Ecgric was killed in battle by Penda of Mercia. Anna was praised by Bede for his devotion to Christianity and was renowned for the saintliness of his family: his son Jurmin and all his daughters – Seaxburh, Aethlthryth, Aethelburh and possibly a fourth, Wihtburh – were canonised.