A Renaissance man, also known as a polyglot, is a person who excels in a variety of different fields. In this respect, many historians consider Leonardo da Vinci not just as a Renaissance man, but as the ideal model of the Renaissance man himself, because of his expertise and mastery of a variety in a variety of fields.
Leonardo da Vinci has been described as a "universal genius" with an "unquenchable curiosity" and "inventive imagination". Known as one of the greatest painters of all time, he painted what is perhaps the most famous face in the world, the Mona Lisa. Aside from his paintings, he also had a variety of interests and was actually a supremely talented individual, perhaps the most talented in recorded history. His works spanned "invention, painting, sculpting, architecture, science, music, mathematics,engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography", as well as paleontology and ichnology. His Da Vinci Notebooks, a collection of notes he has written throughout his life also reveal design studies for inventions that included an early parachute and other "flying machines".
So, it is because of all his interests, and a demonstrated expertise in a lot of them, that people consider Leonardo da Vinci as the ideal Renaissance man.
Source:
Leonardo da Vinci. https://en.wikipedia.org/wiki/Leonardo_da_Vinci