On April 18, 1815, a convoy including the Duke of Bourbon, the cousin of the King of Spain, Ferdinand VII, was making its way over the Arlaban Pass that marks the border between Araba and Gipuzkoa. On the steep climb up the hill, the carriage containing the duke, which was being pulled by two oxen, became slightly separated from the convoy. Seizing the opportunity, five armed men appeared from out of the woods and proceeded to liberate the duke of all the equipment, treasures, and documents he was carrying.
The Arlaban Pass had, it should be noted, gained an infamous reputation for such highway robbery. Indeed, many of the so-called highwaymen gained a kind of infamous notoriety, men like the guerrillas Espoz and Mina as well as Sebastián Fernández de Leceta or “Dos Pelos” (Two Hairs).
Witnesses to the robbery said that the thieves were Basques, as could be discerned from their accents, which also led people to believe they came from an area between Tolosa and Hernani in Gipuzkoa. The main suspect was subsequently thought to be one N. de Lazkao, who was fairly identifiable because of his green eyes and red beard. But despite the dispatch of multiple search parties and an investigation that lasted ten years, no one was ever apprehended.
Information sourced from Iñaki Egaña, Mil noticias insólitas del país de los vascos (Tafalla: Txalaparta, 2001), pp. 167-68.