Luis Carrero Blanco (4 March 1904 – 20 December 1973) was a Spanish Navy officer and politician, who served as Prime Minister of Spain from June 1973 until his assassination in December of that year. He participated in the two major Spanish conflicts of the Interwar period: the Rif War in Morocco, and later the Spanish Civil War, in which he supported the Nationalist side. Carrero Blanco, a long-time confidant and right-hand man of Francisco Franco, was one of the most prominent figures in the Francoist dictatorship's power structure, holding throughout his career a number of high-ranking offices such as those of Undersecretary of the Prime Minister's Office and Deputy Prime Minister. He also was the main drafter behind the 1947 Law of Succession to the Headship of the State. Carrero ended up succeeding Franco as head of government in June 1973, due to Franco's worsening health. Shortly after his ascension to the premiership Carrero Blanco was assassinated in a roadside bombing on 20 December 1973 by the armed Basque nationalist group Euskadi Ta Askatasuna (ETA) while returning from Mass in his car. He was posthumously awarded the nobiliary title of Duke of Carrero Blanco.