Sultan (1943–1944), Assistant State Treasurer (1944–1945), Territorial Chief (Ketua Jajahan) of Kota Bharu (1945–1948) and Regent of Kelantan (3–30 June 1953; 12 August–12 December 1958). Succeeded on the death of his father on 9 July 1960. Installed at the Istana Balai Besar, Kota Bharu, 10 December 1960, and crowned there by the Tengku Panglima Raja on 17 July 1961. Became Deputy Supreme Head of State Timbalan Yang di-Pertuan Agong from 22 July 1970, and Yang di-Pertuan Agong on 21 September 1975. He was Col-in-Chief the Malaysian Artillery Regt (1966–1979). Patron of The Kelantan Royal Project. Rcvd: DKM, DK (21 July 1939), DMN (17 July 1961), and SMN (31 August 1958) of Malaysia, SPMK (9 August 1950), SJMK (9 August 1959), SPSK, DK of Brunei (1961), Terengganu (23 June 1964), Selangor (21 July 1966), Kedah (5 July 1969), Pahang, and Perlis (13 February 1978), and DP of Sarawak. He was first married to Tengku Zainab binti Tengku Muhammad Petra (1917–1992) on 4 June 1939. His third marriage was to Tengku Alexandria binti Tengku Yusuf. He died of a heart attack at Istana Negara, Kuala Lumpur on 29 March 1979 and was buried at the Royal Cemetery, Kampung Langgar. 1979–2010: Sultan Ismail Petra ibni Almarhum Sultan Yahya Petra Sultan. Born at Istana Jahar, Kota Bharu on 11 November 1949, eldest son Yahya Petra and Tengku Zainab. Educated privately and at Sultan Ismail College, Kota Bharu. Installed as heir apparent (as Tengku Mahkota) on 11 November 1967. Served as regent during the absence of his father from the state (6–25 July 1974; 12 July–28 August 1975; 21 September–29 March 1979). Succeeded on the death of his father on 29 March 1979. Crowned at Istana Balai Besar, Kota Bharu on 30 March 1980. He was formally deposed in favour of his eldest son by the Kelantan Royal Succession Council of State, on the grounds of incapacity after failing to fully recover from a debilitating stroke on 13 September 2010 (after an amendment to the state constitution gazetted 22 July 2010). Thereafter styled Duli Yang Maha Mulia Sultan Ismail Petra. He was Maj TA (1 November 1974), prom Hon Lieut-Col (1 January 1976), Hon Col (15 March 1988), and Hon Maj-Gen, Colonel-in-Chief of the Royal Artillery Regt (1997), and of the Royal Intelligence Corps. Hon D.Phil. from the University Malaysia Sabah (2007). He was patron of the Royal Kelantan Club until 1992. Rcvd: DK, SPMK,