chapter room, the cloister, the main chapel and the aisles, as well as the western facade and tower. The chapter room was probably built between 1293 and 1314: it is the cathedral's oldest Gothic structure, a diaphanous, square-plan hall covered by an eight-sided dome, under which several noble lineages decided to build their burials. The Gothic cloister was already a work in progress around 1300, although it wasn't finished until the mid-15th century: it was built thanks to the generous contributions of the Camara Santa's Brotherhood (established in 1344), several noble patrons and Castilian king Alfonso XI, as well as the money gathered by the bishop's tax collectors. It's a rectangular space surrounded by galleries, whose tracery windows reflect the evolution of the Gothic style, from early classic to late flamboyant. At last, Oviedo episcopate decided to undertake the construction of a new church: this implied the gradual demolition of the old pre-Romanesque basilica, which was probably regarded as old fashioned and inconvenient. Bishop Gutierre de Toledo fostered the erection of his own private funerary chapel (destroyed during the Early Modern period) and the main chapel, a poligonal apse preceded by a square section: the late Gothic altarpiece and the Baroque ambulatory have modified the appearance of this sanctuary, whose walls were originally pierced by two levels of windows. The works evolved at a slow pace, and by 1451 only the main chapel had been concluded. However, during the second half of the 15th century this situation was reversed, and by 1500 both the transept and the three aisles were finished. According to some scholars, there must have existed a first, "general" draft inspired by certain French models, like the Bayonne Cathedral: in any case, this initial draft would be altered as the construction works progressed. By 1450, we find Nicolás de Bar and Nicolás de Bruselas, two master builders from Northern Europe, supervising the Oviedo workshop: apparently, it was during their direction when the new flamboyant style was introduced. After them, Spanish master builders Juan de Candamo (between 1458 and 1489) and Bartolomé de Solórzano (between 1492 and 1498) assumed the direction of the cathedral workshop, building the central and side aisles, as well as the innovative vaults of the central aisle, with multiple ribs and detached tracery pieces. By 1500, the cathedral was almost finished, with exception of its western facade: that very year, master builder Juan de