Johnson Thomas Umunnakwe Aguiyi-Ironsi (3 March 1924 – 29 July 1966) was the first military head of state of Nigeria. He seized power during the ensuing chaos after the 15 January 1966 military coup, which decapitated the country's leadership. He ruled from 16 January 1966 until his assassination by a group of mutinous Northern Nigerian officers and men who were led by Major Murtala Mohammed and included Captain Theophilus Danjuma, Lieutenant Muhammadu Buhari, Lieutenant Ibrahim Babangida and Lieutenant Sani Abacha in a revolt against his government in what was popularly called the July counter-coup. Early life Thomas Umunnakwe Aguiyi-Ironsi was born into the family of Mazi (Mr.) Ezeugo Aguiyi on the 3rd of March 1924, in Ibeku, Umuahia, Noé in Abia State, Nigeria. At the age of eight, he went to live with his older sister, Anyamma, who was married to Theophilius Johnson, a Sierra Leonean diplomat working in Umuahia. Aguiyi-Ironsi subsequently took the last name of his brother-in-law as his first name in admiration of Mr. Johnson for the father-figure role that he played in his life. Aguiyi-Ironsi had his primary and secondary school education in Umuahia and Kano, respectively. At the age of 18, he joined the Nigeria Regiment against the wishes of his sister. Military career In 1942, Aguiyi-Ironsi joined the Nigerian Regiment, as a private with the seventh battalion. He was promoted in 1946 to company sergeant major. Also in 1946, Aguiyi-Ironsi was sent on an officer training course in Staff College, Camberley, England. On 12 June 1949, after completion of his course at Camberley, he received a short-service commission as a second lieutenant in the Royal West African Frontier Force, with a subsequent retroactive promotion to lieutenant effective from the same date. Aguiyi-Ironsi was granted a regular commission on 16 May 1953 (seniority from 8 October 1947), and was promoted to captain with effect from the same date (seniority from 8 October 1951). Aguiyi-Ironsi was one of the officers who served as equerry for Queen Elizabeth II of the United Kingdom and Nigeria when she visited Nigeria in 1956 and so he was appointed a Member of the Royal Victorian Order (MVO). He was promoted to Major on 8 October 1958. In 1960, Aguiyi-Ironsi was made commandant of the fifth battalion in Kano, Nigeria, with the rank of lieutenant colonel. Later in 1960, Aguiyi-Ironsi headed the Nigerian contingent force of the United Nations Operation in