[1] 最高敬語 - Wikipedia (, ) https://ja.wikipedia.org/wiki/%E6%9C%80%E9%AB%98%E6%95%AC%E8%AA%9E
[2] 最高敬語、絶対敬語、自尊敬語とは何ですか? - ======①最高敬語=地の... - Yahoo!知恵袋 (LY Corporation, ) https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1329169608
While kinship terms continued to be used, a royal vocabulary known as "raja-sap" (Thai: ราชาศัพท์; RTGS: Rachasap) emerged.