The most northerly roman fort investigated

[D B Campbell]

Quite a bold statement that it would predate the Limes Germanicus...

The claim (as far as I recall) is based (a) on the definition of a frontier as a closely-watched military road, and (b) on slight hints of a Flavian date from the Gask Ridge watch-towers. I am a sceptic. However, we can certainly celebrate Stracathro as the most noertherly Roman fort!