The battle of Tamarón Historical milestone · Tamarón, Odra-Pisuerga, Burgos Image of Tamarón, not of the place itself. The Battle of Tamarón pitted the troops of the Leonese king Bermudo III against those of the Count of Castile Fernando Sánchez and his ally García Sánchez, King of Pamplona, in 1037. The clash originated in the dispute over the Tierra de Campos, between the Cea and Pisuerga rivers, which Bermudo III wanted to recover for León and which Ferdinand I considered the dowry of his wife Sancha, sister of the Leonese king. Chronicles place the combat in the valley formed by the Sambol stream, east of Castrojeriz. Bermudo III died in the charge, allegedly at the hands of seven enemies; 21st-century autopsies have counted sixteen lance wounds, all fatal. Without descendants, the throne passed to his sister Sancha, who ceded it to her husband Ferdinand I, thus uniting the crowns of Castile and León. 1037 Photo: Rodelar (CC BY-SA 4.0) What to see and do in Tamarón