 Most unusually, he created a circular capilla mayor (principal chapel) rather than a semicircular apse, perhaps inspired by Italian ideas for circular 'perfect buildings' (e.g., in Alberti's works).Within its structure the cathedral combines other of the Vitruvian orders of architecture.Subsequent architects included Juan de Maena (1563–1571), followed by Juan de Orea (1571–1590), and Ambrosio de Vico (1590–?