second part of the facade was also erected in the 13th century. It contains in its middle a rosette of Cistercian inspiration, with tracery of a six-pointed star, or of Solomon's seal. The third part show an elegant gallery marked by spires and several pinnacles, and consists of two large windows with mullions and tracery of three quadrilobed oculi. Under the eight arches that form the mullions of both arches are placed the statues of the first eight kings of Castile from Ferdinand I of León "the Magnus" to Ferdinand III of Castile "the Saint". Above it stands a thin rail-cresting of pointed arches with a statue of the Virgin and Child, accompanied by the inscription Pulchra es et decora ("Thou art fair and beautiful"), alluding to the Mother of Christ. This final addition was made in the mid-15th century by Juan de Colonia. Above the side doors of the first part were raised two almost identical towers in the 13th century. They consist of three stories, with pilasters decorated with pinnacles and statues at their corners, and with decorated openings pointed on each side of each story: one flared with mullion and tracery with an oculus, covered with stained glasses, in the first; two are arranged in pairs without mullion and without tracery, in the second; and two other are arranged in pairs with mullion and tracery, in the third. In the middle of the 15th century, Juan de Colonia raised on these towers open pyramidal needles or spires with an octagonal base. Their fine fretwork definitely shaped the silhouette of the Burgos cathedral. He originated from Cologne (as Johan von Köln). His design matches the project of the Cologne Cathedral, which at that time only existed in drawings that he could have seen. The spires of the Cologne cathedral were only added much later. The spires of the Burgos cathedral were raised with the financial contributions of the bishop Alonso de Cartagena and of his successor at headquarters, Luis de Acuña, whose coats of arms, along with the Castilian-Leonese monarchy, appear in the parapets that connect to the tops of the towers. In these parapets master Juan also had the inscription pax vobis and the sculpture of Christ showing the footsteps of his Passion, in one, and the inscription ecce agnus dei and a sculpture of Saint John the Baptist, in the other. Two polygonal turrets mark the