Some 230,000 people were killed in the Indian Ocean tsunami set off by a magnitude 9.1 earthquake on December 26, 2004. A dozen countries were hit, from Indonesia, to India and Africa's east coast.
King Vajiralongkorn, 66, became constitutional monarch after the death of his revered father, King Bhumibol Adulyadej, in October 2016 after 70 years on the throne. The coronation follows a period of mourning.
An announcement in the Royal Gazette said Suthida Vajiralongkorn Na Ayudhya is legally married to the 66-year-old King Maha Vajiralongkorn and is now Queen Suthida.
Thailand's vote is viewed as a contest between junta leader Prime Minister Prayuth Chan-ocha – who wants to stay on as the elected leader – and a "democratic front" of anti-junta parties.
Thai Princess Ubolratana Mahidol accepted her nomination by the Thai Raksa Chart Party in an Instagram post. Hours later, Thailand's King called her candidacy "inappropriate and unconstitutional" and vetoed the move.
Thailand has been without a monarch since King Bhumibol's death, with the head of the king's advisory council, Prem Tinsulanonda, 96, serving as regent.
Born on December 5, 1927 in the US state of Massachusetts, King Bhumibol Adulyadej was the world's longest-serving head of state and the longest reigning monarch in Thai history.
Thai King Bhumobol Adulyadej said to be recovering from fever after a year in hospital.
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