A substantial Roman building on the site of St Nicholas's Church revealed during excavations in 1955/6 (ECC655). Some of the masonry walls had been used as foundations for the later church. The building encroached upon an earlier street (MCC1570). The surviving walls were part of an extensive building which 'may have covered the most part of the Insula'. Several of its walls ran south and west beyond the limits of the largest phase of the church. Due to its size and construction it is likely that this was a public building although the excavators questioned its level of importance.<1>