Vitruvius was born around 80 BC. He was a famous military engineer and architect. While most of his life is undocumented (including exactly where he lived), it is known that was alive while Italy was under the rule of the Roman Empire. He is most known for his theories about proportions in temples and the human body, including the first recorded measurements that would inspire da Vinci to sketch his Vitruvian Man.

Source: Isaacson, Walter. “Vitruvian Man”. Leonardo Da Vinci. Simon & Schuster, 2017.

Photo Source: https://www.thefamouspeople.com/profiles/vitruvius-34320.php