Men date telugu
He cited twenty grammatical aphorisms ascribed to Kanva, and concluded that Kanva wrote an ancient Telugu Grammar which was lost.
A Rajeswara Sarma discussed the historicity and content of Kanva's grammar.
Further, Tummalagudem inscription of Vishnukundinas belongs to 5th Century CE. The period from 575 CE to 1022 CE corresponds to the second phase of Telugu history, after the Andhra Ikshvaku period.
This is evidenced by the first inscription that is entirely in Telugu, dated 575 CE, which was found in the Rayalaseema region and is attributed to the Renati Cholas, who broke with the prevailing custom of using Sanskrit and began writing royal proclamations in the local language.
Telugu literature was initially found in inscriptions and poetry in the courts of the rulers, and later in written works such as Nannayya's Mahabharatam (1022 AD).
During the time of Nannayya, the literary language diverged from the popular language.
During this period the split of the Telugu from Kannada alphabets took place. The Vijayanagara Empire gained dominance from 1336 to the late 17th century, reaching its peak during the rule of Krishnadevaraya in the 16th century, when Telugu literature experienced what is considered its Golden Age.