In eastern India, Bengali Kayasthas are believed to have evolved from a class of officials into a caste between the 5th-6th centuries and 11th-12th centuries, its component elements being putative Kshatriyas and mostly Brahmins. They most likely gained the characteristics of a caste under the Sena dynasty. According to Tej Ram Sharma, an Indian historian, the Kayasthas of Bengal had not yet developed into a distinct caste during the reign of the Gupta Empire, although the office of the Kayastha (scribe) had been instituted before the beginning of the period, as evidenced from the contemporary Smritis. Sharma further states:
