A royal proclamation on appointment of the ruler of <a href="https://en.wikipedia.org/wiki/Nan_Province" class="extiw" title="w:Nan Province">Nan Principality</a> dated 18 November 122 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Rattanakosin_Era" class="extiw" title="w:Thai solar calendar">RE</a> (2446 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Buddhist_Era" class="extiw" title="w:Thai solar calendar">BE</a>, 1903 <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 29 November 1903 <a href="https://en.wikipedia.org/wiki/Common_Era" class="extiw" title="w:Common Era">CE</a>.
Government of Siam (now Thailand).
1903-11-29
"<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2446/035/610.PDF">Prakat tang phrachao nakhon mueang nan long wan thi sippaet phruetsachikayon rattanakosinsok nueng roi yisip song (phutthasakkarat song phan si roi sisip hok)</a>" [Proclamation on Appointment of Prince of <a href="https://en.wikipedia.org/wiki/Nan_Province" class="extiw" title="w:Nan Province">Nan Principality</a> dated 18 November 122 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Rattanakosin_Era" class="extiw" title="w:Thai solar calendar">RE</a> (2446 <a href="https://en.wikipedia.org/wiki/Thai_solar_calendar#Buddhist_Era" class="extiw" title="w:Thai solar calendar">BE</a>)]. (1903, 29 November). <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 20, Part 35. pp. 610–611.