Bangkok began as a small trading center and port community serving Ayutthaya, which was the capital of Siam until it fell to Burma in 1767. A temporary capital was established at Thonburi, across the river from Bangkok. In 1782, King Rama I built a palace on the river and made Bangkok his capital, renaming it Krung Thep, however in the west the old name of the city continued to used.
The full ceremonial name of Krung Thep is:
Krung Thep Mahanakhon Amon Rattanakosin Mahinthara Ayuthaya Mahadilok Phop Noppharat Ratchathani Burirom Udomratchaniwet Mahasathan Amon Piman Awatan Sathit Sakkathattiya Witsanukam Prasit,
The city of angels, the great city, the residence of the Emerald Buddha, the impregnable city (unlike Ayutthaya) of God Indra, the grand capital of the world endowed with nine precious gems, the happy city, abounding in an enormous Royal Palace that resembles the heavenly abode where reigns the reincarnated god, a city given by Indra and built by Vishnukarn.
it holds the world's record for longest placename...and when i read 'unlike ayutthaya' in the translation i laughed and felt certain that terry pratchett must have had a hand in it...somehow.