Angkor Thom is a bit unique compared to the other sites within the ancient city of Angkor in that it is not just a temple, but a city. It was actually the longest lasting capital city during the era of the Khmer Empire (802-1431) and can be thought of as a town within the larger city of Angkor. The great king Javayarman VII built this city around the same time as Ta Prohm and is most famous for its central temple called the ‘Bayon.’