South North dynasty and Sui dynasty (North dynasty 386-577, South dynasty 420-589, Sui dynasty 581-618)

After the Sima family (the emperor family of Jin dynasty) went south of Chang Jiang river, China become two independent countries, south and north. Both south and north countries have 4 or 5 dynasty. This is the longest time of split and chaos. But calligraphy still have some great achievements. Two schools of calligraphy formed during this time. The south dynasties inherited the custom of Jin dynasty. Tablet were forbidden since Jin dynasty so there're more ties. But the north dynasties didn't have this prohibition thus there're more tablets.