work in Thai script, but some historians questioned its authenticity. Trai Phum Phra Ruang, written in 1345 by King Maha Thammaracha I, expounds Buddhist philosophy based on a profound and extensive study with reference to over 30 sacred texts and could be considered the nation's first piece of research dissertation. During the Ayutthaya Kingdom, new poetic forms were created, with different rhyme schemes and metres. It is common to find a combination of different poetic forms in one poetic work. Lilit Yuan Phai is a narrative poem describing the war between King Borommatrailokkanat of Ayutthaya and Prince Tilokkarat of Lan Na. One of the most beautiful literary works is Kap He Ruea composed by Prince Thammathibet in the nirat tradition. Traditionally, the verse is sung during the colourful royal barge procession and has been the model for subsequent poets to emulate. The same prince also composed the greatly admired Kap Ho Khlong on the Visit to Than Thongdaeng and Kap Ho Khlong Nirat Phrabat. Despite its short period of 15 years, Thon Buri Period produced Ramakian, a verse drama contributed by King Taksin the Great. The era marked the revival of literature after the fall of Ayutthaya. During the 18th century Rattanakosin period, which still fought with the Burmese, many of the early Rattanakosin works deal with war and military strategy. Some examples are Nirat Rop Phama Thi Tha Din Daeng, Phleng Yao Rop Phama Thi Nakhon Si Thammarat. In the performing arts, perhaps the most important dramatic achievement is the complete work of Ramakian by King Rama I. In addition, There were also verse recitals with musical accompaniment, such as Mahori telling the story of Kaki, Sepha relating the story of Khun Chang Khun Phaen. Other recitals include Sri Thanonchai. The most important Thai poet in this period was Sunthorn Phu (สุนทรภู่) (1786–1855), widely known as "the bard of Rattanakosin" (). Sunthorn Phu is best known for his epic poem Phra Aphai Mani (), written during 1822 and 1844. Phra Aphai Mani is a versified fantasy-adventure novel, a genre of Siamese literature known as (). Some of the most well-known modern Thai writers include Kukrit Pramoj, Kulap Saipradit, (penname Siburapha), Suweeriya Sirisingh (penname Botan), Chart Korbjitti, Prabda Yoon and Duanwad Pimwana. The works tended to be light fiction. Music and dance Aside from folk and regional dances (southern Thailand's Menora (dance) and Ramwong, for example), the two major forms