The predominant language of Bangladesh is Bengali (also known as Bangla). Bengali is one of the easternmost branches of the Indo-European language family. It is a part of the Eastern Indo-Aryan languages in South Asia, which developed between the 10th and 13th centuries. Bengali is written using the Bengali script. In ancient Bengal, Sanskrit was the language of written communication, especially by priests. During the Islamic period, Sanskrit was replaced by Bengali as the vernacular language. The Sultans of Bengal promoted the production of Bengali literature instead of Sanskrit. Bengali also received Persian and Arabic loanwords during the Sultanate of Bengal. Under British rule, Bengali was significantly modernised by Europeans. Modern Standard Bengali emerged as the ''lingua franca'' of the region. A heavily Sanskritized version of Bengali was employed by Hindu scholars during the Bengali Renaissance. Muslim writers such as Kazi Nazrul Islam gave attention to the Persian and Arabic vocabulary of the language.