The announcement of the <a href="https://en.wikipedia.org/wiki/Ministry_of_Interior_(Thailand)" class="extiw" title="w:Ministry of Interior (Thailand)">Ministry of Interior of Siam</a> regarding the administrative organisation of the Malay cities of <a href="https://en.wikipedia.org/wiki/Syburi" class="extiw" title="w:Syburi">Sai Buri</a>, <a href="https://en.wikipedia.org/wiki/Perlis" class="extiw" title="w:Perlis">Palit</a>, and <a href="https://en.wikipedia.org/wiki/Satun_Province" class="extiw" title="w:Satun Province">Satun</a>, dated 7 April 116 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Rattanakosin_Era" class="extiw" title="w:Thai solar calendar">RE</a> (2440 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Buddhist_Era" class="extiw" title="w:Thai solar calendar">BE</a>, 1897 <a href="https://en.wikipedia.org/wiki/Common_Era" class="extiw" title="w:Common Era">CE</a>), as published in the <i><a href="https://en.wikipedia.org/wiki/Royal_Thai_Government_Gazette" class="extiw" title="w:Royal Thai Government Gazette">Royal Thai Government Gazette</a></i> on 9 May 1897 <a href="https://en.wikipedia.org/wiki/Common_Era" class="extiw" title="w:Common Era">CE</a>. The announcement was signed, and perhaps authored, by <a href="https://en.wikipedia.org/wiki/Damrong_Rajanubhab" class="extiw" title="w:Damrong Rajanubhab">Damrong Rachanuphap</a>, prince of Siam, son of King <a href="https://en.wikipedia.org/wiki/Mongkut" class="extiw" title="w:Mongkut">Mongkut</a>.
Government of Siam (now Thailand).
1897-05-09
"<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2440/006/73_1.PDF">Prakat krasuang mahatthai long wan thi chet mesayon rattanakosinsok nueng roi sip-hok (phutthasakkarat song phan si roi sisip)</a>" [Announcement of the Ministry of Interior dated 7 April 116 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Rattanakosin_Era" class="extiw" title="w:Thai solar calendar">RE</a> (2440 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Buddhist_Era" class="extiw" title="w:Thai solar calendar">BE</a>, 1897 <a href="https://en.wikipedia.org/wiki/Common_Era" class="extiw" title="w:Common Era">CE</a>)]. (1897, 9 May). <i><a href="https://en.wikipedia.org/wiki/Royal_Thai_Government_Gazette" class="extiw" title="w:Royal Thai Government Gazette">Royal Thai Government Gazette</a></i>. (Volume 14, Part 6). pp. 73–75.