Yan Zhenqing (709 - 785) was a leading Chinese calligrapher and a loyal governor of the Tang Dynasty. His artistic accomplishment in Chinese calligraphy parallels the greatest master calligraphers throughout the history, and his calligraphy style, "Yan", is the textbook-style that every calligraphy lover has to imitate today. Wikipedia
The definitive Wikipedia entry for Yan Zhenqing. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Yan_Zhenqing