Yuwen Shu
He was a confidant of Emperor Yang ( Yang Guang ) and was instrumental in Yang Guang's displacement of his brother Yang Yong as crown prince; therefore , after Yang Guang became emperor , Yuwen Shu became exceedingly powerful and was one of two generals who spearheaded Yangdi's efforts in the Goguryeo-Sui Wars . 
<triplet> Emperor Yang <subj> Yang Yong <obj> sibling <triplet> Yang Yong <subj> Emperor Yang <obj> sibling