The asker has said that this relates to the ancient Greek city of Adrano in Sicily, known by the Romans as Hadranum.

"At intervals a single block ran through the entire thickness of the wall and formed a header on either side (a diatonos), adding greatly to the stability of the wall. Arranged at regular intervals, the diatonoi
created masonry “chains” throughout the course of the wall. With the
diatonoi coordinated vertically, walls were conceptualized as a series of compartments divided by headers; this design permitted higher and stronger wall construction that was more resistant to siege weapons."

In fact you could say 'masonry "chains" known as diatonoi'.