Question: Ivar the Boneless had a brother who held what position in the mid-ninth-century?
Sentence (from "Kim Yong-ju"): Under his brother's rule, Kim Yong-ju held key posts in the Workers' Party of Korea during the 1960s and early 1970s, but he fell out of favor in 1974 following a power struggle with Kim Jong-il.
Relevant evidence: No