Sultan of Pahang is the title of the constitutional head of Pahang, Malaysia. The current sultan is Ahmad Shah. He is the Head of the Islam in the state and the source of all titles, honours and dignities in the state.
After the Srivijaya empire collapsed, around the 1000, Pahang was claimed first by Majapahit, Siam, and then by Sultanate of Malacca. Pahang was fought over by the Portuguese, the Dutch, Johor, and Aceh for most of the 16th century. During this time, its population was mostly killed or enslaved, its rulers murdered and its economy ruined.
After the decline of Aceh in the mid-17th century, Pahang came under the rule of Johor. However, Sultans of Pahang, descended from the Malacca and the Bendahara Johor royal dynasties, have ruled the state almost continuously from 1470, and gradually recovered a great degree of autonomy.
As the Johor Empire was falling apart with the loss of the Riau-Lingga territories, Temenggung Ibrahim of Johor understood this situation and quickly signed a treaty with Bendahara Tun Mutahir of Pahang in 1861. The treaty recognizes the territories of Johor (mainland), the Temenggung and his descendent's right to rule it, mutual protection and mutual recognitions of Pahang and Johor. With the signing of this treaty, the remnants of the Empire became 2 independent states, Johor and Pahang.
Pahang (Malay pronunciation: [paˈhaŋ]) is the third largest state in Malaysia, after Sarawak and Sabah, and the largest in Peninsular Malaysia. The state occupies the huge Pahang River river basin. It is bordered to the north by Kelantan, to the west by Perak, Selangor, Negeri Sembilan, to the south by Johor and to the east by Terengganu and the South China Sea.
Its state capital is Kuantan, and the royal seat is at Pekan. Other important towns include Jerantut, Kuala Lipis, Temerloh and the hill resorts of Genting Highlands, Cameron Highlands, Bukit Tinggi and Fraser's Hill.
The Arabic honorific of Pahang is Darul Makmur ("Abode of Tranquility").
The ethnic composition is roughly 1,000,000 Malay and Bumiputra, 233,000 Chinese, 68,500 Indians, 13,700 others, and 68,000 non-citizens.
Based on Chinese records, Pahang was known to the Chinese as Phang or Pahangh, other variations include Pang-Hang, Pang-Heng, Pong-Fong, Phe-Hang, and Pang-Kang and others. In 1225, Chau Ju-Kua wrote the book Chu-Fan-Chi and mentioned that amongst the states controlled by San-Fo-Chi was one called Peng-Keng, supposedly modern day Pahang.