High Quality Content by WIKIPEDIA articles! Yumjaagiin Tsedenbal (Mongolian: Юмжаагийн Цэдэнбал; September 17, 1916 - April 20, 1991) was one of the leaders of Mongolia from 1952 to 1984. During his political life, he served as prime minister and general secretary of the Mongolian People`s Revolutionary Party.