Angkor Thom was a fortified city of some 10 sq km in extent, which was built by Angkor's greatest king, Jayavarman VII who ruled between 1181 and 1201. The major attraction of Angkor Thom is the Bayon, which lies at the centre of Angkor Thom and whose exact function and symbolism is still unknown. The Baphuon, a pyramidical representation of mythical Mt Meru lies near the Bayon.