The conquest of Alfonso VI Historical milestone · Mestanza, Sierra Morena, Ciudad Real The chronicles place in 1086 the taking of Mestanza by the troops of Alfonso VI, in the Castilian advance on the passes of Sierra Morena. From the Andalusi period there remain the ruins of a castle above the present settlement. 1086 Photo: Driebex (CC BY-SA 4.0) What to see and do in Mestanza