The Palace of Eternal Life (simplified Chinese: 长生殿; traditional Chinese: 長生殿; pinyin: Chángshēng diàn; Wade–Giles: Ch'ang-sheng tian), also translated as The Palace of Eternal Youth, is a play written by Hong Sheng (Chinese: 洪昇/洪升) in the Qing dynasty. He absorbed certain material from the long narrative poem The Song of Everlasting Sorrow written by Bai Juyi and the zaju Rain on the Paulownia Tree (Chinese: 梧桐雨) written by Bai Renfu. The Palace of Eternal Life is acclaimed as one of the China's "Four Great Classical Dramas", along with The Peony Pavilion, The Peach Blossom Fan and Romance of the Western Chamber. The performance is focused on the everlasting love story of Emperor Xuanzong of Tang and his favorite consort Yang Guifei.