Pattani or Sultanate of Pattani was a Malay sultanate that covered approximately the area of the modern Thai

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

 provinces of Pattani

Pattani Province

Pattani is one of the southern provinces of Thailand. Neighboring provinces are Narathiwat, Yala and Songkhla.-Geography:...

, Yala

Yala Province

Yala is the southernmost province of Thailand. Neighboring provinces are Songkhla, Pattani and Narathiwat. Yala is the only land-locked province in the south of Thailand...

, Narathiwat

Narathiwat Province

Narathiwat is one of the southern provinces of Thailand. Neighboring provinces are Yala and Pattani. To the south it borders the Malaysian state of Kelantan. The southern railway line ends in this province that is one of the nation’s five provinces that borders Malaysia. The name of this...

 and much of the northern part of modern Malaysia. The King of Patani is believed to have converted to Islam

Islam

Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

 some time during the 11th century. The 6-7th century Hindu state of Pan Pan

Pan Pan

Pan Pan is a lost small Hindu Kingdom believed to have existed around 3rd-7th Century CE., somewhere in Kelantan or Terengganu, Malaysia. Little is known about this kingdom. The kingdom was later conquered by Srivijaya under the leadership of Dharmasetu before 775 CE...

 may or may not be related.
Langkasuka

Langkasuka

Langkasuka was an ancient Hindu Malay kingdom located in the Malay Peninsula...

 was a Hindu

Hindu

Hindu refers to an identity associated with the philosophical, religious and cultural systems that are indigenous to the Indian subcontinent. As used in the Constitution of India, the word "Hindu" is also attributed to all persons professing any Indian religion...

-Buddhist kingdom founded in the region as early as the 2nd century that appeared in many accounts by Chinese

Chinese people

The term Chinese people may refer to any of the following:*People with Han Chinese ethnicity ....

 travelers, the most famous of whom was the Buddhist pilgrim I-Ching.