 Xi Zuochi put forth an alternative judgment, stating that as Wei neither controlled the whole of China nor had imperial blood in its ruling house, it should be considered an illegitimate dynasty, no better than the Xin Dynasty of Wang Mang.According to Xi Zuochi's biography in the "Book of Jin", he formulated his theory of dynastic legitimation in the "Annals of Han and Jin" in order to curb and correct his overambitious patron, Huan Wen.Even the work's title, naming the Han and Jin dynasties without mention of the intervening Wei, is indicative of its primary thrust.