Bengali is said to have been derived from Sanskrit but early Sanskrit texts derived it. Now the question arises how did this language develop. From the fourth-third centuries BCE, commercial ties developed between Bengal and Magadha which may have led to the growing influence of Sanskrit. During the fourth century the Gupta rulers established political control over north Bengal and began to settle Brahmanas in this area. Thus, the linguistic and cultural influence from the mid-Ganga valley became stronger. In the seventh century the Chinese traveller Xuan Zang observed that languages related to Sanskrit were in use all over Bengal. From the eighth century, Bengal became the centre of a regional kingdom under the Palas. Between the 14th and 15th centuries Bengal was ruled by Sultans. In 1586, when Akbar conquered Bengal, it formed the nucleus of the Bengal Suba, While Persian was the language of administration, Bengali developed as a regional language.
By the 15th century the Bengali group of dialects came to be united by a common literary language based on the spoken language of the western part of the region, now known as West Bengal. Thus, although Bengali is derived from Sanskrit, it passed through several stages of evolution. A wide range of non-Sanskrit words, derived from tribal languages, Persian and European language, have become part of modem Bengali.