 Once they rendezvoused with Li Heng, they returned to Lingwu with Li Heng.Once they arrived in Lingwu, Du and another imperial official who had accompanied Li Heng, Pei Mian, advocated that Li Heng should take the throne in light of the emergency the empire was facing.Li Heng agreed, and he was declared emperor (as Emperor Suzong) — an act that Emperor Xuanzong later recognized.