"The "Halmidi inscription" has put an end to many controversies surrounding the evolution of Kannada. The 16-line inscription, which is on rectangular sandstone with a height of 2.5 ft. and a width of 1 ft., has a Vishnu Chakra on its top. The earliest Kannada inscription found at Halmidi in w:BelurBelur taluk of Hassan district is dated 450 A.D., and it is the earliest known record in Kannada characters."
January 1, 1970
https://en.wikiquote.org/wiki/Kannada_language