In each side--apparently in the middle of each side--there was one gate, and the streets within the walls were laid out at right angles to one another.

A man who stood at a certain spot in the middle of the Gymnasium could see straight to all the four gates.[30] Here is the chess-board pattern in definite form, though the central portion of the city may have been laid out under the influence of spectacular effect rather than of geometry.
[30] Strabo, 565, 566.
_Sicyon, Thebes, &c._ Another Macedonian town-plan may be found at Sicyon, a little west of Corinth.

This old Greek city was rebuilt by Demetrius Poliorcetes about 300 B.C., and is described by a Greek writer of the first century B.C.as possessing a regular plan and roads crossing at right angles.

The actual remains of the site, explored in part by English and French archaeologists early in the nineteenth century, show some streets which run with mathematical straightness from north-east to south-west and others which run from north-west to south-east.[31] These streets might, indeed, date from the period when Sicyon was the chief town of the Roman province of Achaia, the period (that is) between the overthrow of Corinth in 146 B.C.and its restoration just a century later.

But that was not an epoch when such rebuilding is likely to have been carried through.