Context: Despite the continuing prominence of Nanjing (then known as Jiankang), the settlement of Qiantang, the former name of Hangzhou, remained one of the three major metropolitan centers in the south to provide major tax revenue to the imperial centers in the north China. The other two centers in the south were Jiankang and Chengdu. In 589, Qiangtang was raised in status and renamed Hangzhou.

Question: What was Nanjing formerly known as?
Answer: Jiankang

Question: What was the former name of Hangzhou?
Answer: Qiantang

Question: Besides Qiantang and Jiankang, what was the other major metropolitan center in the south?
Answer: Chengdu

Question: What year was Qiantang raised in status and renamed Hangzhou?
Answer: 589

Question: How many major metropolitan centers were there in the south at the time?
Answer: three

Question:  What is Nanjing currently known as?
Answer: Unanswerable

Question:  What is Jiankang formerly known as?
Answer: Unanswerable

Question:  What is the current name of Hangzhou?
Answer: Unanswerable

Question: What happened in 578?
Answer: Unanswerable