At first, Zhu Di said his war was only against the "bad helpers" who told his nephew to hurt their family. When his war was successful and he took Yingtian (now Nanjing), he made himself the Yongle Emperor. He said that his nephew had never been the real emperor and killed many people in the old government. He did not trust the people in Yingtian, so he made Beiping the main capital city. The southern capital then became known as Nanjing and the northern capital Beijing, the names they continue to use today. In Beijing, he built a new home which became the Forbidden City.