 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 . 
