During the ancient chola period, varahi worship was so famous as she is the head comander of Goddess Parashakthi. Chola's famous king Rajarajan ruled a vast empire by worshipping Varahi. In Thanjavur Bragadeeswarar temple, first worship is given to Varahi amman. Due to varahi worship agriculture was so developed as food production was so abundant.
See related posts about varahi in jagamani blog.