located in the downtown area of Kota Bharu, was constructed in 1840 under the orders of Sultan Muhammad II (r. 1835–1886). It replaced the old palace at Kota Lama as the administrative centre of the sultanate, and also served as the residence of a number of sultans. Since its completion, the town where the palace is located was named Kota Bharu (meaning "new fort") and later became the state capital of Kelantan. It now serves as the main palace for state ceremonial functions. Istana Telipot (Telipot Palace), located in Kota Bharu, served, until recently, as the official residence of the current sultan whilst he was heir-apparent. Istana Bukit Tanah (Bukit Tanah Palace), located in Tumpat, It is understood that the palace was built before the Japanese rule of about 1910, during the reign of Sultan Ismail Ibni Almarhum Sultan Muhammad IV. Istana Kota Lama (Old Fortress Palace), located on the banks of the Kelantan River, is the old palace of the modern sultanate, and served as the official residence of the sultans of the early 19th century. Its proximity to the river made it subject to flooding, and was replaced by the Istana Balai Besar in 1840, and subsequently renamed (Kota Lama means "old fortress"). However, it continues to be used as the official residence of the current crown prince, Tengku Muhammad Faiz Petra and Kelantan royal family. Istana Jahar (Jahar Palace), located in downtown Kota Bharu, was built in 1887 by Sultan Ahmad (r. 1886–1890) for his son and heir-apparent, Sultan Muhammad III (r. 1890–1891). The name Jahar was taken from the tree that stands at the entrance, also known as "Flame of the Forest". It now houses the Museum of Royal Traditions and Ceremonies (Malay: Muzium Adat Istiadat Diraja). Istana Batu (Batu Palace), located in downtown Kota Bharu, was completed in 1939 under the reign of Sultan Ismail I (1920–1944). It was built as a wedding gift for his nephew and eventual successor, Sultan Yahya Petra (r. 1960–1979). It later served as the residence of the next crown prince, Sultan Ismail Petra. It now houses the Royal Museum (Malay: Muzium Diraja). Succession The succession order of Kelantan sultanate is determined by agnatic primogeniture. No female may become ruler, and female line descendants are generally excluded from succession. According to Laws of the Constitution of Kelantan (in Malay language: Undang-undang Tubuh Perlembagaan Negeri Kelantan), the Sultan of Kelantan must