A law enacted by King <a href="https://en.wikipedia.org/wiki/Rama_V" class="extiw" title="w:Rama V">Rama V</a> of Siam for establishing a special tribunal to try criminal offences concerning a nobleman called <a href="https://en.wikipedia.org/wiki/th:%E0%B8%9E%E0%B8%A3%E0%B8%B0%E0%B8%A2%E0%B8%AD%E0%B8%94%E0%B9%80%E0%B8%A1%E0%B8%B7%E0%B8%AD%E0%B8%87%E0%B8%82%E0%B8%A7%E0%B8%B2%E0%B8%87_(%E0%B8%82%E0%B8%B3_%E0%B8%A2%E0%B8%AD%E0%B8%94%E0%B9%80%E0%B8%9E%E0%B8%8A%E0%B8%A3)" class="extiw" title="w:th:พระยอดเมืองขวาง (ขำ ยอดเพชร)">Phra Yot Mueang Khwang</a>, dated 8 February 1921, as published in the <i>Government Gazette</i> on 11 February 1921.
Government of Siam (present-day Thailand)
1921-02-11
"<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2436/046/499_1.PDF">Phraratchabanyan tang san rapsang pen kan phiset khrang nueng samrap chamra khon nai bangkhap sayam thi tong ha wa kratham khwamrai phit kotmai thi thung chiang kam lae thi kaeng chek mueang kham muan</a>" [Royal statute on establishment of special tribunal ad hoc for trying Siamese subjects accused of committing offences and violating laws at Chiang Kham Plain and at Chek Isle, Kham Muan Town]. (1921, 11 February). <i>Royal Thai Government Gazette</i>. Volume 10, Part 46. Pages 499–505. (In Thai).