 Kavirajamarga (850) by King Amoghavarsha I is the earliest available book on rhetoric and poetics in Kannada, though it is evident from this book that native styles of Kannada composition had already existed in previous centuries. Kavirajamarga is a guide to poets (Kavishiksha) that aims to standardize these various styles. The book refers to early Kannada prose and poetry writers such as Durvinita, perhaps the 6th-century monarch of Western Ganga Dynasty.
