Construction begins on the Grand Palace, the royal residence of the King of Siam in Bangkok, at the command of King Buddha Yodfa Chulaloke.

The Grand Palace is a complex of buildings at the heart of Bangkok, Thailand. The palace has been the official residence of the Kings of Siam since 1782. The king, his court, and his royal government were based on the grounds of the palace until 1925. King Bhumibol Adulyadej, resided at the Chitralada Royal Villa and his successor King Vajiralongkorn resides at the Amphorn Sathan Residential Hall, both in the Dusit Palace, but the Grand Palace is still used for official events. Several royal ceremonies and state functions are held within the walls of the palace every year. The palace is one of the most popular tourist attractions in Thailand, with over eight million people visiting each year.

The monarchy of Thailand is the constitutional form of government of Thailand. The king of Thailand is the head of state and head of the ruling Chakri dynasty.

Bangkok, officially known in Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in central Thailand and has an estimated population of 10 million people as of 2024, 13% of the country's population. Over 17.4 million people live within the surrounding Bangkok Metropolitan Region as of the 2021 estimate, making Bangkok a megacity and an extreme primate city, dwarfing Thailand's other urban centres in both size and importance to the national economy.

Phutthayotfa Chulalok, also known by his regnal name Rama I, was the founder of the Rattanakosin Kingdom and the first King of Siam from the reigning Chakri dynasty. He ascended the throne in 1782, following the deposition of King Taksin of Thonburi. He was also celebrated as the founder of Rattanakosin as the new capital of the reunited kingdom.