Within the courtyard area are parts of other possibly earlier buildings, which include for various structures and the remains of a corn-drying kiln and a water tank.

[3] Following the Roman occupation, the site remained unoccupied until the Middle and Late Anglo-Saxon periods (between 650-850 and 850-1066 AD), until a settlement was established near the centre of the fort.

Finds during the archaeological excavation include four Roman coins of the mid 4th century, as well as seven small hoards, the remains of wattle and daub walling, pottery, glass, part of a pewter plate, and grain.

At the time of its construction, the site of the fort would have been on the north side of an estuary, at the mouths of the Rivers Ant, Bure, Yare, and Waveney.

[3] The Roman Saxon Shore fort of Burgh Castle lies a few miles to the southwest; its ruins are much more extensive than those at Caister.