The oldest extant literature written in chữ Hán comprises a corpus of 11th century poems written by Buddhist monks. By the 13th and 14th centuries poems in chữ Hán were written for the court by Confucian scholars such as Lê Quát (b?), Mạc Đỉnh Chi (d 1346), Trương Hán Siêu (d 1354), Chu Văn An (d 1370) and Nguyễn Trung Ngạn (1289-1370), along with important historical works such as Lê Văn Hưu's Đại Việt Sử Ký ('Brief History of Đại Việt') and a range of geographical and encyclopaedic volumes.