The oldest known labyrinth figure is the Classical 7 Circuit labyrinth (sometimes also called: the Cretan labyrinth). Its origin is about 1200 B.C. The further development falls in the time of the Roman empire from 165 B.C. till 400 A.D. The general name is Roman labyrinth and there are different types again. They have in common that different sectors (mostly four) are run one after the other.
In his book “Labyrinths and Mazes of the World” (published in 2003 by Gaia Books, London) Jeff Saward has described how the development of the Roman labyrinth from the Classical labyrinth is possible. Her I only want to put this across in a few steps.
We begin with the Classical labyrinth in square form.
In the drawings the boundary lines are shown in black. The seed pattern contained therein is emphasized in blue. The ways are put in orange, in the same width as the boundary lines.
The whole figure is reduced to a quarter through a rotation. The vertical parts of half the seed pattern move to a horizontal line.
To generate an entire Roman labyrinth from the quartered labyrinth, another two circuits must be inserted in every sector: One around the middle, and one at the outside. In the outer rings one walks to the the next sector, the last path leads to the center.
If one examines exactly the paths, one can recognize that the way is the same as the way back in a Classical labyrinth. Or differently expressed: In a Roman labyrinth one wanders four times the way back of a Classical labyrinth.
The path sequence can be understood with the help of the figures. So one well can see the Classical labyrinth inside the Roman labyrinth.
Even better one recognizes the relationship with the Classical labyrinth in the diagram illustration.
The Roman labyrinth is self-dual like it is the Classical labyrinth. One sees this well in the following graphics. Howsoever the diagram is rotated or mirrored, the path sequence is always the same. Also it plays no role whether one walks in direction to the center or reversed, or whether one fancies the entrance below or on top.
There are different historical Roman labyrinth of this kind. The oldest one comes from the second century A.D. and is to be seen on a mosaic in Pont Chevron (France). This is why Andreas Frei calls it type Pont Chevron (see link below).