They were built between 260 and 310 AD. They
are 2.140 metres in thickness between 8 and 12 metres in height. The walk
along the walls - the adarve - is wholly passable, and is between 4.5
and 7 metres wide.
In ancient times, the monument was composed
of 85 blocks or towers, spaced close together and surrounded by a defensive
ditch. Nowadays, 72 of the blocks remain and 8 have been demolished and
rebuilt. These semi-circular defensive towers had two storeys in Roman Times,
of which the first was on the level of the wall-top walk, with three or four
arcade windows.
Throughout its history, the walls have
suffered a number of assaults and have been rebuilt on occasion; the most
important rebuilding took place in 1972 when the houses placed in the gaps
between the blocks were removed.
Nowadays, the Walls are pierced by ten gates,
of which four date back to Roman times. The reminder were created as the needs
of the expanding city dictated.
Official
web site for Lugo(Spanish)