Kammala jumla mai zuwa: Masarautar Ayutthaya ta fito ne daga mandala na jihohin birni a Lower Chao Phraya Valley a ƙarshen ƙarni na sha huɗu yayin faduwar Daular Khmer. Bayan karni na fadada yankuna, Ayutthaya ya zama mai da hankali kuma ya zama babban iko a kudu maso gabashin Asiya. Ayutthaya ta fuskanci mamayewa daga daular Toungoo ta Burma, wanda ya fara gwagwarmayar ƙarni tsakanin manyan ƙasashe biyu, wanda ya haifar da
Farkon Faduwar Ayutthaya a shekara ta 1569. Koyaya, Naresuan (1590 <unk> 1605) ya 'yantar da Ayutthaya daga ɗan gajeren mulkin Burma kuma ya faɗaɗa Ayutthaya ta hanyar soja. A shekara ta 1600, masarautar masarautar ta hada da wasu biranen-jihohi a cikin Malay Peninsula, Sukhothai, Lan Na da wasu sassan Burma da Cambodia, kodayake ikon Ayutthaya akan makwabta ya bambanta a tsawon lokaci. A cikin ƙarni na sha shida da goma sha bakwai, Ayutthaya ya fito a matsayin en entrepôt na cinikin ƙasa da ƙasa kuma al'adun ta sun bunƙasa. An bayyana mulkin Narai (1657<unk>1688) a matsayin "Zamanin Zinare" na al'adun Siamese kuma an san shi da tuntuɓar tarihi tsakanin kotun Siamese da Turawa, musamman ma'aikatar diflomasiyyar Siamese zuwa kotun Sarki Louis XIV na Faransa a 1686.