Thousands of people protested in Bangkok on Saturday in the latest in months of anti-government demonstrations that have also called for reforms to Thailand’s powerful monarchy.

King Maha Vajiralongkorn of Thailand has received the credentials of Qatar's ambassador extraordinary and plenipotentiary in Bangkok Ahmed bin Ali al-Tamimi.

Hundreds of Thai protesters scuffled with police and threw blue paint at them on Tuesday and, after 21 of them were arrested, chanted "release our friends!" as the royal motorcade of King Maha Vajiralongkorn swept past.

Tens of thousands of people joined Thailand's biggest protest in years on Saturday, cheering calls to curb the powers of King Maha Vajiralongkorn's monarchy and for the removal of former coup leader Prayuth Chan-ocha as prime minister.

Thailand's Constitutional Court on Tuesday found key figures of the opposition Future Forward Party not guilty of opposing the country's monarchy, an allegation that could have seen the high-profile party banned.

Thailand's King Maha Vajiralongkorn greeted thousands of his subjects from a balcony of his Grand Palace on Monday, the third and final day of coronation ceremonies.

Thailand's King Maha Vajiralongkorn on Saturday completed intricate Buddhist and Brahmin rituals to symbolically transform him into a living god as the Southeast Asian nation officially crowned its first monarch in nearly seven decades.

Thailand's election commission said on Wednesday it is seeking the disqualification of a party that nominated a princess for prime minister, in what would be a set-back for the opposition loyal to ousted former prime minister Thaksin Shinawatra.

The Thai political party that nominated a princess as its candidate for prime minister could be banned from a general election in March after an activist said on Sunday he would file a petition seeking its dissolution.

The Thai princess whose stunning announcement she was running for prime minister was quickly opposed by her brother, the king, thanked her supporters on Saturday, saying she wants Thailand to be "moving forward", but she did not comment on her candidacy.

Thailand's powerful King Maha Vajiralongkorn late Friday described an unprecedented move to make his older sister Princess Ubolratana prime minister as "highly inappropriate" and against "royal traditions".

Thailand began circulating bank notes and coins featuring the image of new King Maha Vajiralongkorn on Friday, officials said.