Tang dynasty

618–907

a golden age that lasted from A.D. 618–907 and is considered the high point in Chinese civilization. The Tang capital city was at Chang'an. Through use of the silk road the Tang dynasty was able to create a powerful economy ruled by the first emperor Li Yuan

For more information-http://www.metmuseum.org/toah/hd/tang/hd_tang.htm

Sui Dynasty

581-618

The Sui Dynasty was a short lived Imperial Dynasty established by Emperor Wen of Sui where Luoyang had become the dynasty’s capital. Emperor Wen’s goals during his reign were the reunification of China’s Northern and Southern parts, the building of the Grand Canal, standardized currency and its unification in all of China, the institution of the Departments and the Six Ministries, and the improvement of the Great Wall as part of their defenses

For more info-http://www.travelchinaguide.com/intro/history/sui/