 In the early 15th century, the architect Filippo Brunelleschi, having studied the remains of Classical buildings in Rome, had created two churches, San Lorenzo's and Santo Spirito, which embodied the Classical precepts.The sculptor Lorenzo Ghiberti had laboured for fifty years to create the bronze doors of the Baptistry, which Michelangelo was to describe as "The Gates of Paradise".The exterior niches of the Church of Orsanmichele contained a gallery of works by the most acclaimed sculptors of Florence