Germans believed that migrants of the Caspian Sea Arians were their ancestors.
Central literature were Vedas sacred scriptures believed by Hindu tradition to be not of human origin having been composed by gods themselves in the previous age.
They were brought to the Indian subcontinent by the Aryan migrants in the second millennium B.C. by oral tradition.
As time went on more and more of the original 100,000 verses were lost. So around 200 B.C. a sage wrote down the remaining verses dividing them in four parts.
Rig-vedas made up of 10 books
Sama-Cedar chanted vedras
Yajur Veda-sacrificial prayers
Atharva Vedas -spells and incantations