The progenitor is Gilleathain na Tuaidh ("Gillian of the battle ax"), who lived in the 13th century. The MacLean quickly became supporters of the powerful MacDonalds and their claim to the title of Lord of the Isles ("Lord of the Isles"); in 1411, for example, the chief fell at the Battle of Red Harlaw . The original castle, Duart Castle on Mull, returned to the clan's possession in 1910.
The MacLean motto is Virtue mine honor ("Virtue is my honor").
Branch of the MacLeans in Prussia and Germany
In 1753 Archibald MacLean, who was probably born on the Grishipol farm, immigrated to Prussia in 1736 on the Scottish island of Coll ( Inner Hebrides ) . The reasons for this are unclear, but are likely to be found in the political and economic situation in Scotland after the last Jacobite revolt was put down by the Battle of Culloden . He landed in Danzig on August 22, 1753 , worked as a merchant in the city of Memel (now: Klaipėda in Lithuania) and then moved to Königsberg , where he died on October 15, 1810. On September 17, 1761 he married Marie Simpson (1736–1806), who was descended from Scottish immigrants. They had six children and founded the still existing branch of the MacLean clan in Prussia and later in Germany.
Lauchlan (II.) MacLean (1805–1879), German administrative and ministerial official and parliamentarian, most recently director in the Prussian Ministry of Commerce, 1874–1879 captain of the lawless society in Berlin