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 Thai coup d'état 2014. On 7 May 2014, the Constitutional Court unanimously removed Yingluck and nine other senior ministers from office over the controversial transfer of a top security officer in 2011. The remaining ministers selected Deputy Prime Minister and Minister of Commerce Niwatthamrong Boonsongpaisan to replace Yingluck as caretaker prime minister as protests continued. The RTA intervened on 20 May 2014, when its commander, General Prayut, exercised the power under the act promulgated by King Vajiravudh (Rama VI) entitled "Martial Law, BE 2457 (1914)", to impose martial law nationwide from 03:00. He said through a television pool that the imposition of martial