Gao Jiong
Around the new year 593, Yang Su was made a co-head of the executive bureau (尚書省 "Shangshu Sheng") with Gao Jiong, effectively serving as co-prime ministers, replacing Su Wei in that role. It was said that by this point, Yang Su had become very arrogant, and among the officials, he only respected Gao, Niu Hong (牛弘), and Xue Daoheng (薛道衡), looking down at and bullying the rest. It was commented by traditional historians that he was more talented and had more foresight than Gao, but that he was not as fair-minded or well-behaved as Gao.