Clan MacFarlane is a Highland Scottish clan. Descended from the medieval Earls of Lennox, the MacFarlanes occupied a portion of the western shore of Loch Lomond.
For much of their history, the Macfarlane clansmen were a turbulent lot. In 1589 the MacFarlanes caught Sir Humphrey Colquhoun of Luss having an affair with their then chief's wife. They hunted him down and set fire to his castle. By an act passed in 1594, they were denounced as being in the habit of committing theft, robbery, and oppression.
In 1624 many MacFarlane clansmen were convicted of armed robbery. Their rallying cry, "Loch Sloy", signaled many a night raid to "collect" cattle from their richer neighbors to the south and east. They were so skilled at this “collecting” that the full moon is still known as "Macfarlane's Lantern".