[link to en.wikipedia.org (secure)]

The temple complex was constructed from 1406 to 1420 during the reign of the Yongle Emperor, who was also responsible for the construction of the Forbidden City in Beijing. The complex was extended and renamed Temple of Heaven during the reign of the Jiajing Emperor in the 16th century. Jiajing also built three other prominent temples in Beijing, the Temple of the Sun in the east, the Temple of Earth in the north, and the Temple of Moon in the west. The Temple of Heaven was renovated in the 18th century under the Qianlong Emperor. By then, the state budget was insufficient, so this was the last large-scale renovation of the temple complex in imperial times.

It was renamed. What was it’s original name. The three rings is levels in heaven according to their beliefs. Lol, similar to Mormon belief.