Caisteal Mhic Neill, Cashlie, Glen Lyon, Perthshire

Dun:  OS Grid Reference – NN 49036 41779

Also Known as:

  1. Caistealan nam Fiann

Getting Here

Site shown on 1867 OS-map

Truly remote, but easy to find once you’re nearing the western end of Glen Lyon. Going upstream, past Cashlie Dam, watch out for the well-preserved stone kiln on the left-hand side of the road, just before Cashlie house.  50 yards or further along, cross the road and in the field by the riverside, the circular mass of stones sorta gives the game away.

Archaeology & History

Shown on modern OS-maps as a ‘homestead’ and described variously by archaeologists and historians as a fort or a round-house, this is just one example of around twenty large prehistoric constructions that scatter the stunning mountainous Glen Lyon region which legend tells were the forts of the great hero-figure, Finn.  Three other constructions of the same nature are found just a few hundred yards further up the Glen from here.  Each is of roughly the same age and nature by the look of things.  Their walls are extremely wide and made up of very large rocks, which would have taken huge efforts to construct.

Caisteal Mhic Neill ruins, looking east
Caisteal Mhic Neill, with An Grianan behind

Highlighted on the 1867 OS-map as a “Tower”, the exact nature of this and its adjacent sites has yet to be academically ascertained, with the Canmore website ascribing the monument as a “settlement” – although, tradition tells them to be Scottish forts or duns, so we’ll stick with that until excavations tell otherwise!

The great Gaelic place-name master W.J. Watson (1912) told that:

“The fourth of the Cashlie towers is a few yards south of the road, right in front of Cashlie farmhouse, now a shooting lodge.  Though a quantity of large stones marks the site, the structure has been so badly knocked about that we found it impossible to take measurements sufficient for a plan. It was, however, apparently not circular, but rather oval. Its walls appeared to vary from about 9 feet to 12 feet 6 inches in thickness.”

Close-up of Caisteal walling

This is one of several other duns (or homesteads as the OS-map calls them) close to each other.


Ascribed as one of Glen Lyon’s Caisteilean nam Fiann, or “castles of the Fiann”, Mr Watson (1912) again told how “there is a widely known saying, the earliest notice of which occurs in Pennant, who got it doubtless from the Rev. J. Stewart:

‘…Twelve castles had Fionn,
In the dark Bent-glen of the stones.'”


  1. Gillies, William A., In Famed Breadalbane, Munro Press: Perth 1938.
  2. Watson, W.J., “The Circular Forts of North Perthshire,” in Proceedings of the Society of Antiquaries, Scotland, volume 47, 1912.

ACKNOWLEDGEMENTS:  Many thanks to Andy Sweet of Stravaiging Around Scotland, for pointing me to the W.J. Watson article.  And of course, a huge thanks to Marion—”I don’t have a clue where I am!”—Woolley, for getting us here….

© Paul Bennett, The Northern Antiquarian

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