Roman London - the London wall
These pages are based on a "Royal Commission On Historical Monuments 1834" - actually it is 1928; which is in the public domain.
(42) . Upper Thames street (B). J T smith records that "In June, 1839, the
labourers engaged in deepening a sewer in Thames street, opposite Vintners Hall,
in the middle of the street, at a depth of 10 feet from the surface, discovered
the perfect remains of an old Roman wall, running parallel with the line of the
river. The wall was formed of alternate layers of flint, chalk and flat tiles"
[Streets of London, 380].