Charter of the Merindad de Valdeburón Historical milestone · Burón, La Montaña de Riaño, León Image of Burón, not of the place itself. In 1467 the charter was granted that recognised the autonomy of the Merindad de Valdeburón, a council organisation grouping the villages of the upper Esla that survived until the municipal reform of the nineteenth century. 1467 Photo: Dieguipedia (CC BY-SA 4.0) What to see and do in Burón