Wu Mingche
After Emperor Wu conquered Northern Qi in 577, he promoted Yang Su's title to Duke of Chen'an. In 578, he served under the general Wang Gui (王軌) in defeating the Chen Dynasty general Wu Mingche, and for this contribution, Emperor Wu created his brother Yang Shen (楊慎) the Marquess of Yi'an. After Emperor Wu's death later in 578 and succession by his son Emperor Xuan, Emperor Xuan conferred the title of Duke of Linzhen, which Emperor Wu had posthumously created Yang Fu, on Yang Su, transferring Yang Su's title of Duke of Cheng'an to his brother Yang Yuē (楊約). Yang Su subsequently served under the general Wei Xiaokuan in capturing the region between the Yangtze River and the Huai River from Chen.