Genghis Khan

Ed continued to stare at the Samsara Wheel of Life, curious as to what exactly he should be hoping to learn from it. His knowledge of medicine, leadership, and warfare had improved drastically from reliving his past two lives, but that couldn't possibly by the point of the lesson. 'How does one escape Samsara?' He wondered as he started sinking into yet another past life.

...

"Hmm..." Ed calmly opened his eyes and examined his surroundings. He seemed to be in a lavish library, an expensive-looking book in his hands. Glancing down at it, he saw the title. 'Al-jabr?' He thought to himself. Instinctively, he knew it was one of the earliest books on Algebra, which had originally been invented by the Babylonians and later developed by the Persian mathematician Muhammad ibn Musa al-Khwarizmi. It seemed that he had taken a strong interest in mathematics during this lifetime.