What was a "Renaissance man" how did the Renaissance artists fit into this?

How did the Renaissance artists fit into this? He was most famous as a painter, but he was also a scientist, engineer and mathematician. Leonardo is called a "Renaissance man". Another "Renaissance man" was Michelangelo, who was a sculptor, painter, architect and poet.

Leanardo da vinci and michelangelo they both painted and contributed to the renaissance

the renaissance was the rebirth of greek and roman designs