Wikipedia: "[...] The nave was finished by 1380, and by 1418 only the dome remained incomplete. In 1419, the Arte della Lana held a structural design competition for the dome. The two main competitors were Lorenzo Ghiberti (famous for his work on the "Gates of Paradise" doors at the Baptistery) and Filippo Brunelleschi who was supported by Cosimo de Medici, with Brunelleschi winning and receiving the commission. Ghiberti, appointed coadjutator, was drawing a salary equal to Brunelleschi's and would potentially earn equal credit, while spending most of his time on other projects. When Brunelleschi became ill, or feigned illness, the project was briefly in the hands of Ghiberti. But Ghiberti soon had to admit that the whole project was beyond him. In 1423 Brunelleschi was back in charge and took over sole responsibility. Work started on the dome in 1420 and was completed in 1436. The cathedral was consecrated by Pope Eugene IV on March 25, 1436 (the first day of the year according to the Florentine calendar). It was the first 'octagonal' dome in history to be built without a wooden supporting frame (the Roman Pantheon, a circular dome, was built in 117–128 A.D. with support structures). It was one of the most impressive projects of the Renaissance.".