Clan MacLachlan: Ancient Kings of Cowal, Loyal Allies of the Stewarts, and One of Argyll’s Oldest Gaelic Clans
Clan MacLachlan (Gaelic: Clann Mhic Lachlainn) is one of the most ancient clans of Argyll, tracing its lineage back to the earliest Gaelic rulers of western Scotland. Seated for centuries on the shores of Loch Fyne, the MacLachlans were warriors, landholders, and loyal supporters of the Scottish Crown—particularly the House of Stewart.
Renowned for their steadfast loyalty and ancient pedigree, the MacLachlans occupy a unique and honoured place in Highland history.
Their motto, “Fortis et Fidus” — “Strong and Faithful” — perfectly reflects a clan known for courage in battle and constancy in allegiance.
Origins: Descendants of Lachlan the Norse-Gael
1. Meaning of the Name
MacLachlan derives from the Gaelic Mac Lachlainn, meaning:
“Son of Lachlan.”
The personal name Lachlan itself comes from the Old Norse Lochlann, meaning:
“Land of the Norse”
Or “Norseman”
This reflects the strong Norse-Gaelic heritage of Argyll and the western seaboard.
2. Royal Gaelic Descent
Clan tradition holds that the MacLachlans descend from:
Anrothan O’Neill, an Irish prince of the Cenél nEógain
Who settled in Argyll around the 11th century
Whose descendants also gave rise to Clan Lamont, Clan MacNeil of Barra, and Clan MacEwen of Otter
This places Clan MacLachlan among a group of clans with royal Irish-Scottish Gaelic ancestry.
Clan Territories & Seats
1. Cowal — The Clan Heartland
The MacLachlans held lands throughout Cowal, particularly:
Around Strathlachlan
Along the western shore of Loch Fyne
2. Castle Lachlan
The ancient seat of the clan chiefs, Castle Lachlan, stands as one of the most impressive medieval tower houses in Argyll.
Built in the 15th century
Strategically positioned overlooking Loch Fyne
Still owned by the MacLachlan chief today
3. Strathlachlan
The glen from which the clan takes its name served as:
An agricultural heartland
A gathering place for clan forces
Crest, Motto & Clan Symbols
Crest:
A castle embattled, symbolising defence, strength, and sovereignty.
Motto:
“Fortis et Fidus”
“Strong and Faithful.”
Badge:
Mountain ash (rowan) — associated with protection and Gaelic spirituality.
War Cry:
“I Buaidh!” — “To Victory!”
Clan Allegiances & Political Role
1. Loyal Supporters of the Crown
Unlike many Highland clans that shifted allegiance, the MacLachlans were consistently loyal to:
The Scottish Crown
The House of Stewart
This loyalty shaped much of their political history.
2. Relations with Neighbouring Clans
MacLachlans lived alongside:
Clan Campbell
Clan Lamont
Clan MacLean
Clan MacDonald
Though sometimes rivals, they often cooperated against common threats.
Clan Warfare & Historic Battles
1. Medieval Conflicts
MacLachlans participated in:
Regional disputes in Argyll
Campaigns supporting royal authority
Defence of Cowal from rival incursions
2. The Jacobite Risings
The MacLachlans were firm Jacobite supporters.
1715 Rising
Clan members joined the Earl of Mar’s forces.
1745 Rising
Chief Lachlan MacLachlan of MacLachlan personally led the clan:
Fought at the Battle of Culloden
Was killed in action while rallying his men
His death marked a devastating blow to the clan.
3. After Culloden
Following the Jacobite defeat:
MacLachlan lands were forfeited
Castle Lachlan was damaged
The clan suffered severe financial hardship
Though eventually restored, the clan never fully recovered its former strength.
The MacLachlan Diaspora
Economic hardship and political repression forced many MacLachlans abroad.
Major destinations included:
Nova Scotia
Prince Edward Island
Ontario
The Carolinas
Australia & New Zealand
Despite dispersion, strong kinship ties endured.
MacLachlan Tartans
Clan MacLachlan is associated with several tartans:
1. MacLachlan Modern
Rich greens and blues with red over-stripes.
2. MacLachlan Ancient
Softer hues reflecting natural dyes.
3. MacLachlan Hunting
Earthy tones suited for Highland terrain.
4. MacLachlan Dress
White-based ceremonial sett.
Branches & Name Variants
Surname Variants
MacLachlan
McLachlan
MacLaughlan
MacLauchlan
Lachlan (rarely as surname)
Cadet Families
MacLachlan of Strathlachlan
MacLachlan of Kilbride
Modern Clan Status
Chief of Clan MacLachlan
The clan has a recognised chief:
Madam Gillian MacLachlan of MacLachlan,
Chief of Clan MacLachlan.
Clan Societies
Active MacLachlan associations exist in:
Scotland
Canada
United States
Australia
New Zealand
Cultural Preservation
The clan is actively involved in:
Preservation of Castle Lachlan
Gaelic cultural initiatives
Clan gatherings and Highland Games
Clan MacLachlan Facts at a Glance
Name: MacLachlan / McLachlan
Gaelic: Mac Lachlainn
Meaning: “Son of Lachlan (Norseman)”
Region: Cowal, Loch Fyne
Seat: Castle Lachlan
Crest: Castle embattled
Motto: Fortis et Fidus
Badge: Rowan
War Cry: I Buaidh!
Status: Recognised chief
Conclusion
Clan MacLachlan stands as one of Argyll’s oldest and most honourable clans—deeply rooted in ancient Gaelic and Norse-Gaelic heritage, fiercely loyal to the Scottish Crown, and tragically bound to the Jacobite cause. From the shores of Loch Fyne to the battlefield of Culloden, the MacLachlans upheld their motto of strength and fidelity at great cost.
Though diminished in power, the clan endures—its castle still standing, its lineage unbroken, and its legacy preserved across Scotland and the global diaspora.