Identify and connect to a historic document

Since this is a weekend, put full fundaes :)

Cracked by gammafunction , Goyal , Dibyo , joe , priyananda , Rohan , madhur and varuns88!

Answer: 

1. Leonardo Da Vinci
2. Thomas Coke, the 1st Earl of Leicester
3. Armand Hammer
4. Bill Gates 

Connect: A collection of Davinci’s scientific writings, termed the Codex Leicester. Possibly the best known among his work.

(1) was the first known owner, and it was initially named after him. Wealthy/weird industrialist (2) purchased it and named it the Codex Armand. Bill Gates recently acquired it and renamed it to the original Codex Leicester. It is now part of billg’s collection and displayed occasionally in museums and the like.

Anything Davinci related is, thanks to Dan Brown, related to the Templars. The fact that Armand Hammer had Masonic connections (check the origins of his name) adds to the whole myth. Of course, since Umberto Eco’s book, Rosicrucians seem to have trumped the Templars in secret activities; In fact, the Templars were possibly created by the RCs. Hence, Abulafia permitting, this can now be called a Rosicrucian conspiracy. (Disclaimer: all of this is wild speculation.)