How many Sung Emperors reigned during L/ROCH?

[Ken Cheng]

Approximately fifty years passed between the beginning of LEGEND OF THE CONDOR HEROES and the end of RETURN OF THE CONDOR HEROES. Medieval lifespans being what they were, I imagine there was at least one (if indeed not several) changes of ruler in the Southern Sung Dynasty during those five decades. How many emperors reigned during that time?

[MacGyver]

There should be 3 to 4 Emperors.

Facts:
1. From http://www.agbank.mn/agbankger/index.shtml Ogedei (3rd son) is born in 1187 (Beginning of LOCH).
2. Tuolei (4th son) is about the same age as GuoJing.
3. MongKe died in 1258 (end of ROCH).
4. From http://www.yutopian.com/history/nansong.html, 4 Song Emperors reigned between 1163 and 1265. The first of the 4 emperors died in 1190, 3 years after Ogedei is born.

The uncertainty here is the age difference between GuoJing and Tuolei, and between Tuolei and Ogedei.

[Trien Chieu]

There should be 3 to 4 Emperors.

Facts:
1. From http://www.agbank.mn/agbankger/index.shtml Ogedei (3rd son) is born in 1187 (Beginning of LOCH).
2. Tuolei (4th son) is about the same age as GuoJing.
3. MongKe died in 1258 (end of ROCH).
4. From http://www.yutopian.com/history/nansong.html, 4 Song Emperors reigned between 1163 and 1265. The first of the 4 emperors died in 1190, 3 years after Ogedei is born.

The uncertainty here is the age difference between GuoJing and Tuolei, and between Tuolei and Ogedei.

Ogedei (1185-1241) (Aged 56 years)
Tuolei: (1191-1232) (Aged 41 years)