<i>Trai Phum Phra Ruang</i> ("Three Worlds of Phra Ruang"), a treatise on Buddhist cosmology, composed by Phra Ruang, aka <a href="https://en.wikipedia.org/wiki/Maha_Thammaracha_I" class="extiw" title="w:Maha Thammaracha I">Lithai of Sukhothai</a>, in the year 1864 Buddhist Era (1321/22 Common Era). The work was found in a 10-volume manuscript which the Wachirayan Royal Library obtained from <a href="https://en.wikipedia.org/wiki/Phetchaburi_Province" class="extiw" title="w:Phetchaburi Province">Phetchaburi Town</a>. The manuscript, being a copy of the original document, was created by a monk called Phra Maha Chuai of Wat Klang (present-day Wat Klang Worawihan) in the year 1140 Lesser Era (2321 Buddhist Era, 1778/79 Common Era) during the reign of <a href="https://en.wikipedia.org/wiki/Taksin" class="extiw" title="w:Taksin">Taksin</a>. The work was printed for the first time by the Wachirayan Royal Library in the year 131 Rattanakosin Era (2455 Buddhist Era, 1912/13 Common Era) as the present book.
<bdi><a href="https://en.wikipedia.org/wiki/en:Maha_Thammaracha_I" class="extiw" title="w:en:Maha Thammaracha I"><span title="Ruler of Sukhothai">Lithai</span></a>
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<i>ไตรภูมิพระร่วง</i>. (๒๔๕๕). พระนคร: ม.ป.พ.