Empress Zhangsun
In 645, Emperor Taizong was attacking Goguryeo. Cen followed him on the campaign and was deeply involved in the logistics—so much so that his energy was drained. Emperor Taizong saw that he was speaking in ways that were unusual for him, and became worried, stating, "Cen Wenben came on this campaign with me, but I am afraid he will not return with me." Cen soon grew ill and died in You Prefecture (幽州, roughly modern Beijing). He was buried near the tomb of Emperor Taizong's wife, Empress Zhangsun, where Emperor Taizong would eventually buried himself. His nephew Cen Changqian and grandson Cen Xi later also served as chancellors.