
This 13th-century pedestrian gateway gave access to the Chenizelles district, the Louis IV d'Outremer tower and the Saint-Vincent tank. Its name probably comes from the many canals - or “chenils” in french - that drained the water nearby. If you look up, you can still see the site of its portcullis...
King Philip II, known as ‘Augustus’ - yes, the same king who took part in the famous Battle of Bouvines and who was contemporary with the qasi-achévement of Laon Cathedral - must surely have been responsible for its construction at the turn of the twelfth and thirteenth centuries.
And if you look up on the left, you'll still see iron brackets protruding from the wall, used from 1663 to support a wooden parapet walk...