Poetry has been featured extensively in Thai literature, and constituted the near-exclusive majority of literary works up to the early Rattanakosin period (early 19th century). It consists of five main forms, known as khlong, chan, kap, klon and rai; some of these developed indigenously while others were borrowed from other languages. Thai poetry dates to the Sukhothai period (13th–14th centuries) and flourished under Ayutthaya (14th–18th centuries), during which it developed into its current forms. Though many works were lost to the Burmese conquest of Ayutthaya in 1767, sponsorship by subsequent kings helped revive the art, with new works created by many great poets, including Sunthorn Phu (1786–1855). Prose writing as a literary form was introduced as a Western import during the reign o