Muñagorriren bertsoak

are a set of written bertsos written and published in Gipuzkoa in 1838 during the last stage of the First Carlist War. During the war various bertso leaflets were published, promoting various factions, with some enjoying wide circulation and influence over public opinion across Basque language areas, the main Carlist stronghold.
The Muñagorri bertsos were issued by José Antonio Muñagorri's faction with the aim of creating a split within Carlos de Borbón's supporters and putting an end to the war, in exchange for keeping a reduced version of home rule in the Basque Country. Muñagorri's influence on the ground was small, but his talks with the liberals in Madrid paved the way to the Embrace of Bergara.

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While the whole version extends longer, the reduced, most widely known version is made up of six stanzas, and popularized in modern times by singer-songwriter Benito Lertxundi.
*Top to bottom, left to right