It was during this period that the Chinese first became accustomed to living under a unitary imperial government and under a single royal house. Though the Han Dynasty was briefly interrupted by a Xin Dynasty (9~23 CE), the Liu clan was soon reinstalled to the throne. Totally 15 emperors reigned during the Western Han Dynasty (the first half of Han Dynasty before the Xin Dynasty interregnum), of whom the better-known include Emperors Wen-Di (r. 180~157 BC), Jing-Di (r. 157~141 BC), Wu-Di (r. 141~87 BC), Xuan-Di (r. 74~49 BC), and Cheng-Di (r. 33~7 BC).