The legend of the old Madrid coat of arms
The medieval coat of arms of Madrid had the figure of a bear, and a mysterious phrase that said:
«I went on built water. My walls of fire are. This is my insignia and my coat of arms."
The abundance of water in the form of lagoons, streams and wells gave rise to the legend that the Villa was built on water. The name of Madrid itself refers to the womb or birth of waters (Mayrit)
As for the walls of fire, the explanation is that a good part of the wall was made of flint or flint, a stone that was usually rubbed with another to produce sparks, and thus lit the fire. Well, it seems that When they shot arrows at the wall, sparks flew and the dry grass surrounding the walls caught fire. This is where this other legend would come from: my walls of fire are.
A mural, in the closed door square, reminds us of this legend that so amazed and so awakened the imagination of the inhabitants of distant lands. In the wall painting we see the act of producing the sparks, rubbing the link and the flint, and beneath it a lake of fresh water.
Carlos Osorio (Guided Tours of Madrid)
The old coat of arms of Madrid