Construction of the Santa Maria del Fiore cathedral, also known as il Duomo, was completed in the year 1436. From start to finish, the cathedral took over 140 years to complete. Though Leonardo had no influence on the dome, as it was designed and constructed before he was born, the dome had a great impact on him. Da Vinci loved to incorportate domes into his architectural designs, as they require a combination of mathematical and artistic influences.

Sources: http://www.leonardo-da-vinci.net/architecture/

https://theculturetrip.com/europe/italy/articles/16-interesting-facts-about-florence-cathedral/

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