Analysis of information sources in references of the Wikipedia article "Sung Noen district" in English language version.
Nakhon Ratchasima was originally two separate cities namely Khorakhapura (also called Nakhon Raj) and Sema.... The present city of Nakhon Ratchasima, whose name is a portmanteau of Nakhon Raj and Sema, was established by King Narai (1656-88) as the eastern frontier of his kingdom centred on Ayutthaya.
Nakhon Ratchasima was originally two separate cities namely Khorakhapura (also called Nakhon Raj) and Sema.... The present city of Nakhon Ratchasima, whose name is a portmanteau of Nakhon Raj and Sema, was established by King Narai (1656-88) as the eastern frontier of his kingdom centred on Ayutthaya.