1. His Majesty the Druk Gyalpo is the Head of State and the symbol of unity of the Kingdom and of the people of Bhutan.
2. The Chhoe-sid-nyi of Bhutan shall be unified in the person of the Druk Gyalpo who, as a Buddhist, shall be the upholder of the Chhoe-sid.
3.The title to the Golden Throne of Bhutan shall vest in the legitimate descendants of Druk Gyalpo Ugyen Wangchuck as enshrined in the inviolable and historic Gyenja of the Thirteenth Day, Eleventh Month of the Earth Monkey Year, corresponding to the Seventeenth Day of December, Nineteen Hundred and Seven and shall:
(a) Pass only to children born of lawful marriage;
(b) Pass by hereditary succession to the direct lineal descendants on the abdication or demise of the Druk Gyalpo, in order of seniority, with a prince taking precedence over a princess, subject to the requirement that, in the event of shortcomings in the elder prince, it shall be the sacred duty of the Druk Gyalpo to select and proclaim the most capable prince or princess as heir to the Throne;
(c) Pass to the child of the Queen who is pregnant at the time of the demise of the Druk Gyalpo if no heir exists under section 3(b);
(d) Pass to the nearest collateral line of the descendants of the Druk Gyalpo in accordance with the principle of lineal descent, with preference being given for elder over the younger, if the Druk Gyalpo has no direct lineal descendant;
(e) Not pass to children incapable of exercising the Royal Prerogatives by reason of physical or mental infirmity.
(f) Not pass to a person entitled to succeed to the Throne who enters into a marriage with a person other than a natural born citizen of Bhutan.
6. Upon reaching the age of sixty-five years, the Druk Gyalpo shall step down and hand over the Throne to the Crown Prince or Crown Princess, provided the Royal Heir has come of age.
… (Art. 2)