Regent of Thailand

An unconsecrated king is not considered qualified to carry out the divine and priestly function of a Devarāja (or God-king).

In accordance with the 2017 constitution, if the monarch is to leave the country or is unable to perform his duties for whatever reason, he may appoint any regent or council of regency.

[7] The constitution also requires an appointed regent to take the following oath of office amongst the National Assembly before assuming office:[8] I, (name of the regent), do hereby declare that I will be loyal to His Majesty King (the king's name), and will faithfully carry out my duties in the interest of the nation and her people, and will also uphold and observe the Constitution of the Kingdom of Thailand in all sincerity.Formerly, the law required regency during the incapacity of the monarch.

In January 2017, King Rama X made an unprecedented move to change a draft constitution (later promulgated as the 2017 constitution) by removing the need for the monarch to appoint any regent in such an event, despite the draft having already been approved in a referendum.

[9][10] In accordance with the 2017 constitution, when the throne becomes vacant, the president of the Privy Council of Thailand will act as the regent ad interim until a monarch is installed.

The Regent's flag as mandated by the Flag Act of 1979.
Queen Sirikit took an oath of office amongst the House of Representatives convened at the Ananta Samakhom Throne Hall on 20 September 1956 when she was appointed regent by her husband, King Bhumibol Adulyadej .