Protests since July have increasingly called for reforms to the powerful monarchy, breaking a long-standing taboo against criticising the institution, as well for the removal of Prime Minister Prayuth Chan-ocha and a new constitution.
The plaque was installed on Sunday at Sanam Luang, the field near the Grand Palace in Bangkok where tens of thousands of people rallied peacefully over the weekend.
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.
The Thai Raksa Chart Party is now fighting for its survival after nominating Princess Ubolratana Mahidol as a prime ministerial candidate for the March 24 general elections. Thailand's king had called her move "highly inappropriate."
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.
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