Denis Sassou Nguesso (born 23 November 1943) is a Congolese politician who has been President of the Republic of the Congo since 1997. He was previously president from 1979 to 1992. During his first period as president, he headed the single-party régime of the Congolese Party of Labour (PCT) for 12 years. Under pressure from international sources, he introduced multiparty politics in 1990 and was then stripped of executive powers by the 1991 National Conference, remaining in office as a ceremonial head of state. He stood as a candidate in the 1992 presidential election but was defeated, placing third.