This Noble, Loyal and Benign City was founded in the year 1186 by the King who ennobled it and impressed on its silver coat of arms UT PLACEAT DEO ET HOMINIBUS FOR THE PLEASURE OF GOD AND MEN. In 1189, Pope Clement III granted the city its bishopric.
Its military character and optimum strategic position, together with the need for reconquest of the Castillian King, propitiated the fortification of the city at the end of the 12th century with the building of the city walls and the strengthening of the barbican with 78 turrets and the construction of the nowadays inexistent Alcázar (fortress).
The construction of the Old Cathedral also commenced in the same century, as well as the appearance of the first Palaces and noble mansions, of which a good number still remain. From their beginnings, the Knights of Plasencia participated in numerous battles such as the Batalla del Castillo del puente del Congosto, those of Alardos and Navas de Tolosa, as well as in the taking of the city of Baeza or the reconquest of the city of Seville by Fernando III el Santo.