Demonstrators’ demands include the impeachment of former junta leader Prayuth Chan-ocha as prime minister and a new constitution and elections, as well as reforms that would limit the powers of the monarchy.
They also called for a general strike and for the Thai people to withdraw money and burn the bank books of SCB Bank, which is linked to the royal family.
After rallying in the city on Saturday in the wake of a growing popular reform movement, the protesters planned to present their demands in a letter to King Maha Vajiralongkorn.
Shortly after sunrise on Sunday, protesters cemented a plaque near the Grand Palace in Bangkok in the area known as Sanam Luang, or Royal Field.
It reads: “At this place, the people expressed their will: that this country belongs to the people and is not the property of the monarch as he deceived us.”
The police did not intervene. Government spokeswoman Anucha Burapachaisri said the police would not use violence against protesters and that it was up to the police to determine and prosecute any illegal speech.
“Down with feudalism, long live the people” chanted the demonstrators.
The plaque looks like a plaque removed without explanation from the exterior of one of the royal palaces in 2017, after Vajiralongkorn took the throne.
This plaque, which commemorated the end of absolute monarchy in 1932, has been replaced by another with a pro-monarchist slogan.
“Our biggest victory in two days is to show that ordinary people like us can send a letter to the royal family,” Parit “Penguin” Chiwarak told the crowd.
The palace was not immediately available for comment. The king is not currently in Thailand.