by ▁the ▁birth ▁of ▁this ▁virt uous ▁king , ▁the ▁Ras ht rak uta ▁dynast y ▁became ▁inv inci ble ▁just ▁as ▁the ▁Y ad ava ▁dynast y ▁by ▁the ▁birth ▁of ▁Lord ▁Kr ish na ". ▁ ▁Language ▁While ▁the ▁lingu istic ▁lean ings ▁of ▁the ▁early ▁Ras ht rak ut as ▁( pre - 8 th ▁century ) ▁has ▁caused ▁considerable ▁debate , ▁the ▁history ▁and ▁language ▁of ▁the ▁imperial ▁Ras ht rak ut as ▁of ▁Many akh eta ▁has ▁been ▁free ▁of ▁such ▁confusion . ▁It ▁is ▁clear ▁from ▁ins cri ptions , ▁coin age ▁and ▁pro l ific ▁contempor aneous ▁literature ▁that ▁the ▁court ▁of ▁these ▁Ras ht rak ut as ▁was ▁multi - ling ual , ▁and ▁used ▁S ansk rit ▁and ▁K ann ada ▁as ▁their ▁administrative ▁languages ▁and ▁encourag ed ▁literature ▁in ▁S ansk rit ▁and ▁K ann ada . ▁Ras ht rak uta ▁ins cri ptions ▁outside ▁K arn ata ka ▁are ▁mostly ▁in ▁S ansk rit ▁However ▁this ▁period ▁was ▁the ▁very ▁end ▁of ▁the ▁classical ▁era ▁of ▁literary ▁S ansk rit ▁and ▁P rak rit . ▁As ▁such , ▁from ▁the ▁K av ira j am arga ▁of ▁the ▁ 9 th ▁century , ▁it ▁is ▁known ▁that ▁K ann ada ▁was ▁popular ▁from ▁K aver i ▁river ▁up ▁to ▁the ▁God av ari ▁river , ▁an ▁area ▁covering ▁large ▁territory ▁in ▁modern ▁Mah ar as ht ra . ▁ ▁The ▁Ras ht rak uta ▁ins cri ptions ▁call ▁them ▁the ▁van qu