 In winter 618, after five large birds appeared at Leshou, with an assortment of over 10,000 small birds, and later left, Dou, believing them to be "fenghuang" (phoenixes), changed his era name to "Wufeng" ().Further, at the suggestion of his officials Song Zhengben () and Kong Deshao (), he changed his title to Prince of Xia.Also at this time, Dou surprised and killed another major rebel leader, Wei Dao'er (), who had claimed the title of Emperor of Wei, seizing Wei's forces.