Such is the expectations from the Brahmins, the Manu Dharma Shastra sanctions 1000 times more severe punishment for Brahmin for similar offence committed by the other groups like Kshatriya, Vaisya and Sudras.
There are references to Brahmins from time of the Vedas, about 5000 years old, and in the Purans.
Pippalatha, Katyayani.Angiras,Bharadwaja,Maitri, Gargi are some of the Brahmins who composed the Veda sutras.
Maitri, Gargi and Katyayani were women.
The Brahmins were spread through out the world as were the Vedas.
Later after Sage Viswamitra consigned his sons beyond the Vindhyas to the Dakshina Desa, or Dravida, there appeared a distinction between the Brahmins of the North and those from the South.