Four hundred years ago, Bangkok and Thonburi, an area on the west bank of the Chao Phraya, were just small villages. At that time they served as ports for ships sailing up the river to Ayuthaya, the former capital of what was then called Siam. As ships got larger and the river got shallower, the villages grew in importance.
The kingdom's capital was relocated to Thonburi when Ayuthaya fell to Burmese armies in 1767. King Rama I moved the capital across the river to Bangkok in 1782, because the main Burmese threat to the Thai came from the west, on the Thonburi side of the river.
Bangkok’s history of the past 200 years is much interwoven with the Chakri dynasty which still reigns but no longer rules Thailand today. After Chao Phaya Chakri was crowned under the royal title of Rama I in 1782, one of his first major decisions concerned his capital.
Bangkok was not really founded by Rama I. It had been a settled area for several hundred years already and it had even been well-known to European merchants who commonly stopped over at Bangkok on their way to Ayutthaya.
Bangkok, as you could already read, is not the true name of the city - it called by the Thais as Krung Thep. This name was bestowed on the place in the year 1782 by King RamaI, the father of the Chakri dynasty. The name means "City of Angels" Ayuthaya in the year 1767 was conquered and almost completely destroyed by the Burmese. Those parts of the Thai army that survived the attack fled south to Thonburi on the banks of the Chao Phraya (Menam). There they established a military headquarter and temporary capital of Siam. From Thonburi, the Thai generals engaged in 15 years of war with the attackers (the Burmese had in the meantime been joined by the Laotians and the Vietnamese) and finally managed to drive them out of the country. After the final victory, General Taksin assumed the throne, but was later executed. He was replaced by General Chakri, who as king took the name of Rama I. The king's plan was to rebuild his people's confidence by building a city that could match Ayuthaya's glory and splendor. He decided that Thonburi was no longer suitable as a royal residence and decided to move the capital to Bangkok on the other side of the river.