The Great Peninsular Kingdoms By yaguillahya 1212 Battle of the Navas de Tolosa The Victory in las navas de tolosa enabled the Castilians to cross the Sierra Morena, which made it possible to advance to the Guadiana and Guadalquivir Valleys. 1230 the definitive union of castile 1244 ferdinand 3 ocupiesjaen treaty of almizra 1262 alfonso x conquers niebla 1273 foundation of the mesta 1340 battle of salado 1344 alfonso XI ocupies algeciras 1369 beginning of the trastatamara dynasty 1475 civil war of castile 1492 conquest of granada