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In page Jogo do pau:

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The origins of the jogo do pau are medieval civil techniques of combat, used in times of war by foot soldiers who were often poor peasants who could not afford a better weapon. Evidence of this are found, for instance, from reports on the Battle of Aljubarrota. The technique was incorporated into horseback riding in the medieval book A ensinança de bem cavalgar em toda a sela, 'lit. The art of being a good horseman on any saddle' by Edward I of Portugal (1391–1438).[1] This martial art developed not in the urban areas more open to foreign influences, but in Galiza and the most isolated mountain regions of continental Portugal.