The surrounding walls of the ancient bishops' palace, built on the Roman rampart.
town of Troyes was very soon surrounded by ramparts; when it was still
called Augustobona, it was already surrounded by ramparts which formed
a square perimeter, pierced by four gates on each side. The expansion
of the city during the reigns of the Counts of Champagne "pushed
back" these ramparts to reach, at the end of the 13th century, the
shape of the Champagne cork which we know today. As centuries and threats
of invasions went on, the first wood walls were replaced by stronger stone
walls, supporting many towers and gates located at the strategic entrances
of the city. On the outside of the enclosure and all around the ramparts
there were also ditches, which were filled with water thanks to the elaborate
canal system created by the Counts. These ditches were filled in during
the 19th century, and the ramparts destroyed at a time when the narrowness
of the city gates condemned them to be demolished and to be replaced by
broader streets and boulevards.