The nature of Sung poetry

A transitional period at the beginning of the Northern Sung

960-1000

The middle period of the Northern Sung

1000-1050

Late period of the Northern Sung

1050-1100

End of the Northern Sung and beginning of the Southern Sun

1100-1150

The middle years of the Southern Sung

1150-1200

The end of the Southern Sung

1200-1280.