1.1 Sukhothai period.
According to a celebrated stone inscription credited to King Ramkhamhaeng of Sukhothai, (1781-1981 BE) (1238-1438 AD)
there are two mains of the Thai diet that are rice and fish. (There are rice in the field and fish in the river) so rice and fish are basic ingredient.
1.1 Ayutthaya period.
Traditional Thai cookery involved stewing and baking, or grilling. Many dishes that are now popular in Thailand were originally Chinese dishes. They were introduced to Thailand by the Hokkien people starting in the 15th century, and by the Teochew people in 18th century.
Chinese also introduced the use of a wok for cooking, the technique of deep-frying and stir frying dishes, several types of noodles, taochiao (fermented bean paste), soy sauces, and tofu. Rice noodles were probably common in Ayutthaya
Later, the Chinese brought noodles to Thailand, as well as the introduction of the most important Thai cooking tool: the steel wok.