Thailand's King Maha Vajiralongkorn officially took over the title at the beginning of a three-day, centuries-old coronation ceremony.
The coronation on Saturday comes after the former king, King Bhumibol Adulyadej, died in October 2016 at the age of 88.
After completing the rites on the first day, Vajiralongkorn gave up a royal command that would set the tone for his upcoming government of the country, which still anticipates a 2014 military coup and a controversial contest election less than two months ago.
THE KING OF THAILAND APPOINTS HIS CONSORT AS QUEEN BEFORE HIS FORMAL CORRECTION
the benefit and happiness of the people forever, "said the king, according to the Associated translation Press
The newly-wed 66-year-old king acted as king after the death of his father and was officially crowned by Brahmin, a Hindu priest who played a leading role in the mixed Buddhist-Hindu ceremony.
Vajiralongkorn then put the crown on his head. It is believed that the crown, called the "Great Crown of Victory," dates back to 1782 and is about 26 cm wide and weighs 16 pounds.
NEW THAI GOVERNMENT CAN BE UNSTABLE, SHORT LIFE 19659003] Thailand ended the absolute rule of the monarchs during a revolution of 1932 and introduced a constitutional monarchy. While the king's power abates, they are highly prized by the public and felt to be almost divine.
The king also plays a unifying role in a country that is often in political turmoil because of partisanship and the influence of the military.
But Vajiralongkorn has already made some changes to the power of the crown, including the centralization of royal authority in his hands and the permission to intervene in government affairs.
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as it is protected by the most stringent laws in the world that make any criticism of him or other royalty an offense up to 15 years in prison.
The Associated Press contributed to this report.