The Umachal rock inscription is one of the earliest epigraphic sources discovered in Assam. Dated to the 5th century, the rock description was discovered in the north-eastern slopes of the Nilachal Hills (called Umachal), near Guwahati city.The rock inscription came into view when an old banyan tree was uprooted. The first report on the artifact was published by R. M. Nath The artifact is dated primarily on the basis of the identification of the named Surendravarman with Mahendravarman (fl. c. 470–494) of the Varman dynasty."...in ancient India, kings were sometimes mentioned by the synonyms of their names, Surendravarman may tentatively be identified with Mahendravarman...Surendra and Mahendra both indicate Indra." The script is in the Nagari variety of the Gupta script and the language is Sanskrit prose. Though the Nilachal Hills is known for the Kamakhya Temple, a shakta/tantra site, this temple was for Balabhadra, a god of the Vaishnavite pantheon."...It is, however, more likely that Bhagavata Balabhadrasvamin of the present inscription is no other than the Vaishnavite deity variously called Balabhadra, Baladeva, Balarama, Sankarsana etc."
Another inscription, the Nagajari-Khanikargaon rock inscription, though undated, is sometimes claimed, on stylistic grounds, as the earliest.
Text mahārājādhirāja-śrī surendravarmmaṇā-kr̥tma bhagavataḥ-valabhadra svmināya-idaṁ-guhaṁ
Translation "This cave (-temple) of the illustrious Lord Balabhadra has been constructed by Maharajadhiraja Sri Surendra Varman."
See also Umachal rock cave Kamarupa inscriptions
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