Why this matters
A local fairy fort (ringfort/rath); wider significance not recorded.
Overview
Illanee — Illanee Island is recorded as Fortification in Mayo. This enclosure is situated at the SW end of Illanee or Garrison Island, in Lough Cullen c. 250m from its W shore. It consists of an impressive cashel-like monument (26m N-S
Who made it and when
The saved account records: The monument has been identified by Naessens and O’Conor as a possible pre-Norman fortification dating to the eleventh- / twelfth century (2012, 119-121).
How it was made and used
The saved account records: c. 24m E-W internally) built with stones bonded in mortar.
What was found
The saved account records: This enclosure is situated at the SW end of Illanee or Garrison Island, in Lough Cullen c. 250m from its W shore.
What remains
The saved account records: Much of the mortar has eroded resulting in significant collapse of the enclosing walls in places.
Why it mattered
Illanee — Illanee Island matters because the source ties fortification to this exact landscape and preserves evidence that a bare map name loses. The saved account adds: It consists of an impressive cashel-like monument (26m N-S
History checked 15 August 2026 against the named sources below.
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