Character:Leonardo da Vinci

Historical Context
Leonardo di ser Piero da Vinci was a Renaissance polymath and artist, and probably the most overqualified overachiever in the history of mankind. Seriously, this guy knew everything there was to know during his life.

Post-Resurrection
Da Vinci, for all his skill and talent, had some critical flaws in his understanding of the world. His helicopters could never fly, his tanks would get stuck on the average battlefield. That said, he was a scholar to the end, and once he realized that he had gotten his designs wrong, he tried to figure out the truth behind phenomenon the way he always had, by observing the effects they had.

At some point during the early 11,800's he had a breakthrough, which led him to the differences between the Newtonian, Einsteinian and quantum models of physics, and the physics of the New Real. His model is known as "Da Vinci Theory" or Infinite Theory, and is confirmed by the Descendents to be a 96% accurate reproduction of the physics of the New Real.

The Illuminated Brotherhood
Leonardo, along with Adam Weishaupt and several others, founded the Illuminated Brotherhood in 11842 GHE. The financial activity of the Brotherhood is open for public scrutiny, and whistleblowers make any corruption in the organization public knowledge quickly, preventing the organization from becoming malevolent. Despite being much more transparent than most secret societies, the Brotherhood supposedly does have a few benign secrets, and there's evidence that Leonardo is tied to a few of them.