Who was the Southern Song Dynasty?

Zeng Ji (1 137- 1200), word, number Jing 'an. Jishui, a native of Jizhou (now Jishui, Jiangxi). Brother Zhen, thank you brother Gao. You are born small and different, young and clever, reciting Shen Dan at night, forgetting to eat and sleep, and your family pities you. "Who doesn't study, why bother?" But he won't change. In three years (1 176), he got Lu's version from his hand and wrote a postscript. He had contacts with Zhou Bida and Yang Wanli. Zhou Bida wrote Jing 'an Ming for him, and Yang Wanli wrote Tomb Grave Ming for him. I work hard, but his poems are quiet and light. He wrote ten volumes of Jing 'an Collection, which is no longer circulated today. (See Examples of Song and Yuan Dynasties, Volume 28, Ji, Volume 13 1)