The Scroll of Osiris was the oldest known document of Egypt.
The Scroll was a map to the tomb of Thoth Khepera. In the ages after its creation, it was torn in two, and the two pieces were separated. One half came into possession of Ra's al Ghul, and it took him centuries before he found the other half in Gotham City museum. He combined the two, and worked on a translation in his Cairo hideout.