Scottish Castle: Finlaggan’s Lost Keep Resurfaces

Finlaggan’s “forgotten” fortress resurfaces

Overview

Finlaggan (Islay) is a twin-island medieval power center where archaeologists have identified a 12th–13th-century rectangular stone keep predating the MacDonald Lords of the Isles. Later a palace and council isle, Finlaggan served as the lordship’s ceremonial and administrative hub, reshaping understanding of western Scotland’s seaborne polity.

Cite This Work

Anastasi, L. (2019). Scottish Castle: Finlaggan’s Lost Keep Resurfaces – Medieval History. Medieval History – Yesterday in a Nutshell. https://historymedieval.com/scottish-castle-finlaggans-lost-keep-resurfaces/

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What was found

Mist lifts off Loch Finlaggan, and two low islands appear—Eilean Mòr and Eilean na Comhairle. Beneath their turf, archaeologists have traced the bones of a 12th–13th-century stronghold: a rectangular stone tower with a hall, kitchens, chapel and burial ground, stretched across the twin islets by timber and causeway—a royal-grade castle hiding in plain sight on Islay. 

Across almost three decades of survey, excavation, and re-analysis, Dr David Caldwell and collaborators mapped walls, floors, and service ranges that predate the famous Lordship of the Isles. The newly synthesised evidence—published by the Society of Antiquaries of Scotland—confirms Finlaggan’s earlier life as a high-status fortress of the 1100s–1200s. 

Rectangular stone keeps of this kind were the political architecture of Anglo-French kings and magnates in Britain and Ireland—monuments that announced authority, wealth, and outward connections. Finlaggan’s tower fits that language of power, aligning Islay with broader 12th–13th-century castle-building trends from Carlisle and Bamburgh to Lancaster. 

So who built it? The evidence suggests a royal or quasi-royal patron in the western seaways, before the MacDonald chiefs rose to prominence. The keep was later dismantled—perhaps after structural failure or conflict—then replaced by a palace for the Lords of the Isles, who made Finlaggan their beating heart. This sequence—castle, then palace—tracks with Finlaggan’s shift from fortified residence to governmental centre. 

Picture a hall bright with rushlights, salted beef and imported wine on the board, clerks in the chapel, guards in the yard and boats nosing between the islands. A bridge or causeway tied the working island to the “Council Isle”, where later parliaments of the Isles met around a great stone table. 

The MacDonald chiefs—Lords of the Isles

From the 14th to the late 15th century, the MacDonald lineage ruled a sea kingdom from Finlaggan. Their council gathered on Eilean na Comhairle; inaugurations likely used the famous Footprint Stone—a symbol of sovereignty remembered in early modern accounts and clan tradition. Their realm—Hebrides, Argyll, and slices of the mainland—operated with royal swagger and diplomatic reach, often as peers rather than vassals of Scottish kings. The lordship ended in 1493 when James IV forfeited the title, but its memory saturates Islay. 

The Lords raided deep into the Great Glen; Urquhart Castle on Loch Ness felt their pressure repeatedly in the 14th–15th centuries, with Domhnall of Islay seizing the fortress in the 1390s. The raids, marriages, and councils show a polity calibrated to the tides as much as to thrones. 

What comes next

Finlaggan’s earlier castle reframes Islay not only as the capital of a later sea-kingdom but also as an elite node a century before. Future work—dendrochronology, micromorphology, and targeted trenches—could firm up build phases, causeways, and demolition horizons. In other words, more history sleeps in peat, waiting for careful questions.

Sources

• Caldwell, D. H. (2025). The archaeology of Finlaggan, Islay: Excavations at the centre of the Lordship of the Isles, 1989–1998. Society of Antiquaries of Scotland. https://doi.org/10.9750/978190833256

• McKenzie, S. (2025, September 17). ‘Forgotten’ royal castle uncovered on Scottish island. BBC News. https://www.bbc.co.uk/news/articles/cz693e0zdqeo

• Society of Antiquaries of Scotland. (2025, September 17). New Society book reveals forgotten medieval kingdom and nameless royal castle on Islay. https://www.socantscot.org/uncategorized/new-society-books-reveals-forgotten-medieval-kingdom-and-nameless-royal-castle-on-islay/

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