It is difficult to say precisely at what point in time or where exactly Jiu-Jitsu originated. Despite the efforts of many historians and evidence pointing to Buddhist monks in India, basic elements of grappling can be traced back to places like Greece, India, China, Rome, and even Native America.
When trying to understand the ultimate source of Brazilian Jiu-Jitsu, one must avoid the simplification of attributing its creation to a person, group, or period in time. Jiu-Jitsu, as we understand it today, is a natural and intuitive way of fighting that has rudimentary manifestations in various cultures in different historic moments.
But a martial art is comprised of more than just techniques or fighting strategies. The philosophy that defines the purpose of practice, and the moral code of the practitioners, is a powerful element that determines not only the direction of technical development, but the survival or death of the art itself.
Looking from that point of view, it then makes perfect sense to associate Buddhist monks in India around 2,000 B.C. with the origins of Jiu-Jitsu.
The Buddhist value system of deep respect for all forms of life allowed the development of such a system of self-defense that aimed to neutralize an aggression without necessarily harming the aggressor. Wrapped around important Buddhist principles like acting in a non-harmful way, and the pursuit of self-mastery and enlightenment, Jiu-Jitsu served well the self-defense needs of monks and spread throughout Asia towards China and later Japan, following the Buddhism expansion on that continent.