The Battle of Bairén was fought between the forces of Rodrigo Díaz de Vivar, also known as "El Cid", in coalition with Peter I of Aragon, against the forces of the Almoravid dynasty, under the command of Muhammad ibn Tasufin. The battle was part of the long Reconquista of Spain, and resulted in a victory for the forces of the Kingdom of Aragon and the Principality of Valencia.
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