The occasion of the following notes is the publication of Goffredo Bendinelli's useful monograph on Roman Turin, which raises once more the question of the date to which the Gates of that colonia belong. Bendinelli does not hesitate to adopt Rivoira's view, and classifies these Gates as Augustan. Yet opinions about this matter have veered considerably, and since no writer discusses in detail the structural points upon which the question turns, it seems worth while to do this and to consider at the same time the great Gate at Spello, known as the Torri di Properzio, which closely resembles the Gates of Torino, and about which Rossini at least raised some discussion.
Torino–Augusta Taurinorum. A start is given here by the town-plan and by the sections of D'Andrade. There is no doubt that the chess-board town-plan, with the Wall which bounds it, belongs to the Augustan colonia of 28 B.C., as comparison with the plans of Aemona (34 B.C.) and Aosta (25 B.C.) suffices to prove. Again, the visible part of the Wall, together with D'Andrade's drawings of much that is not now accessible, show that the Wall now visible was the first on its site, and that its construction in receding tiers connects it with the contemporary Wall of Aosta; while its facing, in brick and opus incertum, exactly resembles that of the Theatre of Torino, which formed part of the Augustan lay-out and is now visible in the Gardens of Palazzo Chiablese.