Prime Minister of Thailand sixteen out of twenty-nine, including the incumbent General Prayut Chan-o-cha. Military dominance began with the country's second Prime Minister, Phot Phahonyothin, who ousted his civilian predecessor in a coup in 1933. The longest serving Prime Minister was Field Marshal Plaek Pibulsonggram at 14 years, 11 months and 18 days. The shortest was Tawee Boonyaket at just 18 days. Nine were removed by coups d'état, three were disqualified by court order, and eleven resigned from office. The youngest ever to occupy office was M.R. Seni Pramoj at 40 years old. Thailand received its first female prime minister, Yingluck Shinawatra, in 2011.
2014 interim constitution of Thailand which the NCPO leader can issue any order at will for the sake of the reforms or security. All orders so issued are considered lawful and final. Public discussions about the interim constitution are prohibited by the NCPO. After months of political crisis in which former Democrat Party secretary general Suthep Thaugsuban led a street protest against the government of Prime Minister Yingluck Shinawatra, the Royal Thai Armed Forces staged a coup d'état unseating the government on 22 May 2014. On that day, the military formed the NCPO to rule the nation and partially repealed the 2007 constitution, keeping intact