Korean literature can be classified chronologically into classical and modern periods. Korean classical literature combined indigenous folk traditions with the religious and philosophical principles of Buddhism, Confucianism, and Daoism. A male-dominated educated elite developed the classical body of literature from earliest times to the end of the Chosŏn dynasty in 1910. They wrote in the Chinese script. The Korean script, Hangeul, was introduced in 1446 but did not gain widespread acceptance as a literary language until the 20th century. The accessibility of Hangeul to all classes expanded the social base of Korean literature during the modern period.