It was not until the Northern and Southern dynasties that regular script rose to dominant status. During that period, regular script continued evolving stylistically, reaching full maturity in the early Tang dynasty. Some call the writing of the early Tang calligrapher Ouyang Xun (557–641) the first mature regular script. After this point, although developments in the art of calligraphy and in character simplification still lay ahead, there were no more major stages of evolution for the mainstream script.