Thailand's newly crowned King Maha Vajiralongkorn has begun a royal procession around the capital to visit Buddhist temples and greet his subjects as part of elaborate coronation ceremonies held over three days.
"Long live the king!" shouted well-wishers who lined roads for hours under Bangkok's blazing sun on Sunday, hoping for a glimpse of the constitutional monarch who is revered in Thai culture as a living deity.
King Vajiralongkorn was carried through the streets by 16 men bearing his gilded palanquin.
The monarch was clad in gold-embroidered vestments and wearing the same black military-style hat that his father wore at his coronation 69 years ago.
Conch shell horns heralded the parade, which was accompanied by two horseback cavalry soldiers, a military marching band and royal guards in a mixture of ancient Thai and modern Western-style uniforms.
Spectators all wearing yellow, the colour associated with the king, gathered from early morning along the 7km route from the Grand Palace to three royal temples.
There the monarch, who will be appearing in public for the first time since his elaborate crowning, will pay homage to each temple's main Buddha images.
"I want to see the coronation for once in a lifetime because the last one when it happened I was still very young," Samran Moryaidee, a 77-year-old man, told Reuters as he stood in the steamy heat.
The Thai government, which is spending 1 billion baht ($A44.4 million) on the weekend's coronation ceremonies, has said crowds of at least 200,000 people were expected.
The coronation of King Vajiralongkorn, 66, takes place from Saturday to Monday after a period of official mourning for his revered father, King Bhumibol Adulyadej, who died in October 2016 having reigned for 70 years.
During the 18 months of his reign so far, King Vajiralongkorn has moved to consolidate the authority of the monarchy, including taking more direct control of the crown's vast wealth with the help of Thailand's military government.
His official coronation comes amid the uncertainty of an unresolved election battle between the government's chief and a "democratic front" trying to push the army out of politics.
On Saturday, the king sat on a golden throne under a nine-tiered umbrella and placed the 7.3 kg golden Great Crown of Victory on his head following an elaborate purification ritual.
On Sunday morning, the king granted new ranks and titles to members of the royal family.
The monarch was joined by new Queen Suthida after a surprise announcement three days before the coronation that the thrice-divorced monarch had married for a fourth time.
For the royal procession, the king is to be carried through the streets on a gilded palanquin borne by 16 men walking at about 75 steps per minute and stopping to swap out personnel every 500 metres, according to the palace.
Thailand ended absolute rule by its kings in 1932, but the monarchy remains highly revered as the divine symbol and protector of the country and Buddhist religion.
