Kim developed a personality cult that contributed to his uncontested 46-year rule[6] and extended to his family, including his mother Kang Pan-sok (known as the "mother of Korea"), his brother ("the revolutionary fighter") and his first wife (the "mother of the revolution").[2] The strong and absolute leadership of a solitary great leader, known as the Suryong, is central to the North Korean ideology of Juche.[7] Four years after Kim Il-sung's 1994 death, a constitutional change wrote the presidency out of the constitution and named him as Eternal President of the Republic in order to honor his memory forever.[6] Kim Il-sung was known as the Great Leader,[8] and his eldest son and successor, Kim Jong-il,[6] became known as the Dear Leader[8] and later the Great General.[9]