Oriya is spoken by 87% of the population of Orissa. It became a literary language in the 14th century. Oriya, Bengali and Assamese all come from the same Eastern Magadhi Apabhramsa and are considered to be sister languages. In the 16th and 17th century Oriya fell under the spell of Sanskrit. However, during the 17th and 18th centuries it followed a new line of approach. Oriya has its origins in the 10th century. The history of Oriya language is divided into Old Oriya (10th century-1300), Early Middle Oriya (1300-1500), Middle Oriya (1500-1700), Late Middle Oriya (1700-1850) and Modern Oriya (1850 till present day). Oriya literature upto 1500AD mainly covers poems and proses with religion, gods and goddesses as the main theme.