22 June 1911. Succeeded on the death of his father on 23 December 1920. Crowned at Istana Balai Besar, Kota Bharu, 28 April 1921. Married his first wife Tengku Petri binti Tengku Long. While his second wife was Tengku Nik bin Tengku Kaya Pahlawan and third wife was Wan Mek, from Bukit Marak. His fourth wife was Tengku Sri Mariam binti Tengku Ahmad. He died from tuberculosis, at Istana Jahar, Kota Bharu on 20 June 1944 and was buried in the Royal Cemetery, Kampung Langgar. 1944–1960:Sultan Ibrahim ibni Almarhum Sultan Muhammad IV. Born at Istana Balai Besar, Kota Bharu on 9 October 1897. He was the second son of Sultan Muhammad IV. Granted the title of Tengku Sri Indra Mahkota by his father on 22 June 1911. Appointed as heir apparent (as Raja Kelantan) on 21 April 1921. Succeeded on the death of his brother on 20 June 1944 and proclaimed the next day where he was crowned at Istana Balai Besar, Kota Bharu on 25 October 1944. Attended the Coronation of Queen Elizabeth II in London 1953. His first marriage was to Sultana Zainab binti Tengku Zainal Abidin on 6 July 1914, she was a daughter of Tengku Long Zainal Abidin. His second marriage happened on 1915 (but divorced later in 1929) and was to Tengku Yah binti Tengku Long Sulaiman. Married his third wife, Cik Embong binti Daud in 1916. While he married his fourth wife Cik Siti and fifth marriage to Cik Safiah. While his sixth marriage was to Cik Habiba. He died from a cerebral haemorrhage at Istana Sri Cemerlang, Kota Bharu on 9 July 1960 and buried at the Royal Cemetery, Kampung Langgar. 1960–1979: Sultan Yahya Petra ibni Almarhum Sultan Ibrahim Sultan. Born at Istana Kota Lama, Kota Bharu on 10 December 1917. He was the second son of Sultan Muhammad IV. He was educated at the Francis Light School in Georgetown, Penang, and later in England. Raised by his heirless uncle, Sultan Ismail I. Invested with the title of Tengku Temenggong on 21 July 1939, and prom. to Tengku Bendahara on 6 February 1945. Appointed as heir apparent in preference to his eldest brother and granted the title of Tengku Mahkota on 1 February 1948. Formally invested at the Istana Balai Besar, Kota Bharu, 19 June 1948. He was Vice-President of the Council of Religion & Malay Customs (1941–1947; 1948–1953), Private Sec. to the