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They are culturally Malay Muslim but speak Siamese language.
Most of these communities are almost extinct due to assimilation with the Malays.
Kedah was called Kadaram (Tamil: To the north, Kedah borders the state of Perlis and shares an international boundary with the Songkhla and Yala provinces of Thailand.
In World War II, Kedah (along with Kelantan) was the first part of Malaya to be invaded by Japan.However, an Acehnese account gave a date of 1474 for the year of conversion to Islam by the ruler of Kedah.This later date accords with an account in the Malay Annals where a raja of Kedah visited Malacca during the reign of its last sultan seeking the honour of the royal band that marks the sovereignty of a Muslim ruler.In the middle eastern literature, ancient Kedah was referred as Qilah by Ibn Khordadbeh in Kitāb al Masālik w'al Mamālik, Kalah-Bar by Soleiman Siraf & Abu Zaid al Hassan in Silsilat-al-Tawarikh (travels in Asia), and Kalah by Abu-Dulaf Misa'r Ibn Muhalhil in Al-Risalah al-thaniyah.The famous Tang dynasty Buddhist monk, Yi Jing who visited Malay archipelago between 688–695, also mentioned about a kingdom known as Ka-Cha in the northern part of Malay peninsular, which according to him was 30 days sail from Bogha (Palembang), the capital of Sribogha (Srivijaya).