People across the country gave alms to monks on Sunday morning to make merit for Her Majesty Queen Sirikit on her 86th birthday.
In Bangkok, Prime Minister General Prayut Chan-o-cha and his wife joined an alms-giving ceremony at Sanam Luang.
Also gathered in in front of the Queen’s portrait were several privy councillors, senior government officials, Cabinet members and thousands of ordinary citizens.
Of the 243 monks given alms, 20 were senior monks and abbots of prominent Bangkok temples.
People mostly wore blue, the colour associated with Friday, the day Her Majesty was born.
At 7pm on Sunday, Prayut will preside at a televised hour-long candle-lit ceremony at Sanam Luang to express well wishes to the queen.