King of Wu
Zhang had significantly expanded his domain by 1363, when he declared himself the King of Wu (吴王, "Wu Wang"), possibly following the example of his main rival, the Nanjing-based Zhu Yuanzhang, who had earlier (1361) made himself the Duke of Wu (吴公, "Wu Gong"). Not to be outdone, in 1364 Zhu promoted himself to a King ("Wang") of Wu