Some writings of this period has been discovered, but unfortunately in such small amounts that they have yet to be deciphered.
Knowledge of this great civilization's religion must therefore be based on physical evidence alone.
In 1921, archaeologists uncovered evidence of an ancient civilization along the Indus River, which today runs through northwest India into Pakistan.
The so-called Indus Valley civilization (also known as the "Harappan civilization" for one of its chief cities) is thought to have originated as early as 7000 BC and to have reached is height between 2300 to 2000 BC, at which point it encompassed over 750,000 square miles and traded with Mesopotamia.
The origins and authors of its sacred texts are largely unknown.In addition, no trace of horses or chariots have been found in the remains of the Indus Valley culture, but were central to Aryan military and ritual life.