Ashina Rangan visits Emperor Yang at Luoyang…
607 CE
Ashina Rangan visits Emperor Yang at Luoyang in spring 607.
At the instigation of Yuwen Shu Emperor Yang has Yang Yong's eight sons put to death around the same time.
Emperor Yang abolishes provinces in summer 607 and changes them to prefectures.
At the same time, he reorganizes his father's governmental system of having five main bureaus, keeping four of the main bureaus—the executive bureau (Shangshu Sheng), the examination bureau (Menxia Sheng), the legislative bureau (Neishi Sheng), the archival bureau (Mishu Sheng)—while abolishing the eunuch bureau and replacing it with the palace bureau (Diannei Sheng).
He establishes three additional independent agencies and five independent departments.
He also organized the imperial army into sixteen corps.
He abolishes three levels of noble titles—the counts, the viscounts, and the barons—keeping only the princes, the dukes, and the marquesses.