The great question was, Where is the Mons Grampius of Tacitus?
Dismissing Camden's Grantsbain, because he does not know where it is, Gordon says, "As for our Scotch Antiquaries, they are so divided that some will have it to be in the shire of Angus, or in the Mearns, some at the Blair of Athol in Perthshire, or Ardoch in Strathallan, and others at Inverpeffery." Gordon votes for Strathern, "half a mile short of the Kirk of Comrie." This spot is both at the foot of the Montes Grampii, "and boasts a Roman camp capable of holding an army fit to encounter so formidable a number as thirty thousand Caledonians.

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Here is the Porta Decumana, opposite the Prcetoria, together with the dextra and sinistra gates," all discovered by Sandy Gordon.

"Moreover, the situation of the ground is so very exact with the description given by Tacitus, that in all my travels through Britain I never beheld anything with more pleasure.