Some historians refer to other inscriptions for further insight into Bhaskaravarman's successor, such as the Sanskrit play Mudrarakshasa| by the poet
Viśākhadatta, who is assumed to have lived in Kamarupa. This is because analysis of his name implies that he was among the colony of Brahmins settled by
Bhutivarman and reissued by Bhaskavarman. The end of the play in the final verse references the patron king whose name is reconstructed in several forms but is surmised to be
Avantivarma. By conjecture historians argue that Avantivarma was the final ruler of the Varman dynasty before being overthrown by Salasthambha within the five years of his rule and being killed by him. Avantivarman follows the naming system of previous kings and in Vishakhadatta's play a reference to Varaha is made in the final verse alongside the patronage of the king. The final verse of the play also uses the word referring to the Mlechha unrest throughout the Kamarupa country. Ghosh argues that Avantivarman is the son of Bhaskaravarman. Avantivarman was the father of Grahavarman of Moukhari. The death of Bhaskaravarman had led to the boiling of a mass Mlechha revolt which the poem had described. This brewing of the revolt is attributed partly to Bhaskaravarman who stayed in Karnasuvarna and was absent from Kamarupa in the latter part of his reign. Thus, Vishakadatta's perceived danger of the Mlechha revolt materialised. Other authors, such as Baruah, argue that since Bhaskaravarman was known as Kumara-Raja, it implied he was a bachelor with no direct heir. His immediate successor was rather usurped by Salasthamba. Salasthamba has been argued to be a chief of
Mech ethnicity. The name Mlechha is argued to derive from the ethnonym of the Mech people. Salasthamba's title of
Mlechhadhinatha implies that he may have been the Governor of the Mech country due to its vastly expanded borders under Bhaskaravarman. Salasthama would have been the governor of Mech Country who overthrew Bhaskaravarman's successor and self-proclaimed himself as King. Other historians argue that if Salastambha was a Mech ruler then the inscriptions would use the term
Kirata. The use of the word
Mlechchhas implies that, despite the commonly claimed heritage from the same dynasty, the Salastambha clan seemed to have non Aryan practices. To justify this status, the Hayungthal plate inscriptions narrate a myth of a curse similar to a curse by Vasistha in Kalika Purana|. Chapter 81 narrates that
Yama,
Brahma and
Vishnu requested
Shiva to create a situation where Yama could exercise his authority. Thus, Shiva's devotees and Ugratārā's devotees drove the Aryans out of Kamarupa. This led Vasistha, who was nearly a victim himself, to curse the devotees into becoming Mlechhas. This narrative shows the suppression of Vedic Brahmanical Religion and the predominance of the Tantric Vāmācāra cult of Shiva and Ugratārā. Thus, the term Mlecchas refers to the family's adherence to the Tantic Vāmācāra cult. The Mlechha dynasty king
Harshavarman was recorded powerful enough to conquer new territories in the south and west of which the Kingdom was able to expand towards. Harshavarma's Karamarupa conytrolled the present provinces of Assam, Bengal, Bihar and Orissa with the possible eastern area of Uttar Pradesh and the Northern portion of Madras. However, harshavarman's empire did not last. Yasovarman of Kanauj competed with him for control of Northern India. At the Battle of Bihar Harshavarman was defeated and killed. Yasovarman's court poet, Vakapati, wrote a poem,
Gaudavadha () to record this military victory. Albeit, Vakapati did not name Harshavarman as the defeated King. The overthrow of the king led to anarchy in Bengal. Historians argue that it is not definitively known if Gauda was conquered by Harshavarman or his precessor but that the first quarter of the eight century saw Gauda, Odra, Kaling and Koshala under the kings of Kamarupa. The conquering of Gauda was likely inherited to Harshavarman after Bhaskavarman had done it a century earlier. Bhaskavarman also conquered Bengal, except for Samtata. Harshavarman's death led to the disintegration of the Kamarupa Empire made by Bhakaravarman. The result was a small country in Northern Bengal known as Kamarupa. ==Rulers==