What is recorded here
Eilean Dearg in Loch Riddon held a medieval castle controlling the sea approach into Cowal. The stronghold passed through regional lordship before becoming involved in the Earl of Argyll's failed rising against James VII in 1685. Government forces destroyed the castle with gunpowder, leaving broken walls and rubble across the small red island.
What this place is
Eilean Dearg is a small rocky island containing the low ruins of a medieval castle at a strategic meeting of sea channels.
People and events
Local lords held the castle, Argyll's supporters used it during the 1685 rising, and government forces destroyed it after the rebellion failed.
How it was used
The stronghold watched vessels entering Loch Riddon, sheltered a small garrison and stored supplies in a naturally defended position.
What survives
Shattered wall lines, foundations, fallen masonry and traces of the enclosed castle remain spread across the island's upper ground.
Why it mattered
Eilean Dearg mattered because control of a tiny island guarded Cowal's waterways and its violent destruction records the failed Argyll Rising.
Sources for this account
Sources checked 16 August 2026.
Places near here
Photo credits
- Nick Ray, Wikimedia Commons · CC BY-SA 2.0
- Elliott Simpson, Wikimedia Commons · CC BY-SA 2.0
- Richard Webb, Wikimedia Commons · CC BY-SA 2.0
- Thomas Nugent, Wikimedia Commons · CC BY-SA 2.0
- Andrew McIntosh, Wikimedia Commons · CC BY-SA 2.0
- Maker not stated on source page, tr.pinterest.com
- Maker not stated on source page, br.pinterest.com
- Maker not stated on source page, au.pinterest.com
- John Ferguson, Wikimedia Commons · CC BY-SA 2.0
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