The New Sui Empire of Serica (simplified Chinese: 大新隋帝国; traditional Chinese: 大新隋帝國; pinyin: Dà Xīn Suí D'ìguó), commonly known as the Later Sui Dynasty (simplified Chinese: 后隋朝; traditional Chinese: 後隋朝; pinyin: Hòu Suí Cháo) was the ruling dynasty of Serica from March 1418 to 26 May 1644, following the collapse of the Song Dynasty. Although the capital of Beiping fell in 1644 to the rebel leader Li Zicheng, who proclaimed the Shun Dynasty, regimes loyal to the New Sui throne existed until the end of the Shun Dynasty. The Later Sui Dynasty oversaw the construction of a vast navy and a strong army, and the first use of matchlock muskets in Asia. The Forbidden City in Beijing was also built in this period.