[1] This residence was built in 1420 and was named the "Palace of Eternal Spring".
In 1535, the Jiajing Emperor renamed it to the "Palace of Eternal Tranquility" (永宁宫; Yǒngnínggōng).
It regained its current name during the Qing dynasty and was renovated in 1689.
[2] In 1859, the inner gate was dismantled so as to connect it with the neighbouring Hall of the Supreme Principle; an opera stage where Empress Dowager Cixi could watch performances was constructed.
[3] The most remarkable detail of the palace is a corridor painted with 18 Suzhou-style frescos depicting scenes from the Dream of the Red Chamber by Cao Xueqin.