An evaluation has revealed archaeological deposits over virtually the whole area of the site.

Building described as `Mithraeum'.

Five unfurnished inhumation burials, Castle Park, recorded by Laver in 1892.

Romano-Celtic temple discovered during excavations in 1959, to the west of West Way on the south bank of the River.

Roman timber-lined drain situated to the south of the precinct wall of the Temple of Claudius (MCC1544), recorded in 1964.

11th century (c.AD 1078) Norman Castle Keep built on the foundations of the Roman Temple of Claudius and Bailey defences. The keep was built in at least two main phases and its initial form consisted of a single storey stone keep with crenellated parapet wall. During the early 12th century, the keep's outer walls were raised by at least one storey and a fore-building was added on the south side to protect the main entrance. A barbican replaced this in the 13th century. The castle's earthwork defences consisted of an upper and 'nether' or lower bailey bank and ditch (to the north, and downslope to the town wall) with at least one entrance in the upper bailey's south-west corner, occupying c.5.7ha. in total area. The upper bailey defences had been built by 1101. The northern and eastern arms of the upper bailey defences survive as landscaped earthworks within Castle Park. The southern arms lies just to the north of the High Street, and the western arm, below or just to the east of Maidenburgh Street. The nether bailey is possibly part of a second phase, of the late 12th century. The southern end of the eastern arm of the nether bailey survives as a landscaped ditch in Castle Park. The western arm lies below or just to the east of Maidenburgh Street. A masonry chapel and domestic buildings stood to the south of the keep. The keep was partially demolished by John Wheeley in the 17th century.

Roman street, aligned N to S between Insula 15 and 16, discovered during excavations in Castle Park in 1928/9.

Roman road between London and Colchester, aligned (approx.) E to W on the west side of the walled town. Note that two possible lines of the road are projected by Hull heading west from the Grammar School. It seems probable that the northern-most alignment is most likely, based on investigations east of Silvanus Close (MCC10057) which defined a section of Roman road. This was confirmed by evaluation in 2003, when the roadside ditch was (re-) investigated (MCC2802).

Roman road investigated during excavations at Middleborough (Cattle Market) site in 1979.

Investigations by the Colchester Excavation Committee in 1935.