By the beginning of the fifteenth century, the drum of the church was built. However, the 42 meter wide space above the church's chancel still did not have the planned octagonal cupola, even though a brick model from 1367 already existed (as related in the "Life of Brunelleschi" by Antonio Manetti, ca. 1480). In 1419, the Arte della Lana held a competition to design a dome and cupola for the cathedral. The two main competitors wer...