Note 785 — CANTO XXXI.
James Romanes Sibbald translation
Montereggioni: A fortress about six miles from Siena, of which ample ruins still exist. It had no central keep, but twelve towers rose from its circular wall like spikes from the rim of a coronet. They had been added by the Sienese in 1260, and so were comparatively new in Dante’s time.—As the towers stood round Montereggioni so the giants at regular intervals stand round the central pit. They have their foothold within the enclosing mound; and thus, to one looking at them from without, they are hidden by it up to their middle. As the embodiment of superhuman impious strength and pride they stand for warders of the utmost reach of Hell.