"When looking back on the Renaissance, influential minds and idealists were prevalent, only a select handful equaled brilliance the brilliance of Leonardo DaVinci however. The epitome of the 'modern man', DaVinci revolutionized the ways of math, science and the arts. His ideas and accomplishments benefited generations and his breakthroughs spurred the future to come. Without DaVinci, the world would sorely miss his plethora of discoveries and inventions, such as...."
Then add on what you want to talk about. That's the type of quick thesis statement I would write up to begin a few page essay.