The poet Du Fu returns to Chang'an as a member of Emperor Xuanzong's court, after having escaped the city during the An Lushan Rebellion.

Year 757 (DCCLVII) was a common year starting on Saturday of the Julian calendar. The denomination 757 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Du Fu was a Chinese poet and politician during the Tang dynasty. Together with his elder contemporary and friend Li Bai, Du is often considered one of the greatest Chinese poets of his time. His greatest ambition was to serve his country as a successful civil servant, but Du proved unable to make the necessary accommodations. His life, like all of China, was devastated by the An Lushan rebellion of 755, and his last 15 years were a time of almost constant unrest.

Chang'an was a city in China, located near the modern city of Xi'an, which served as the capital of several Chinese dynasties from 202 BCE to 907 CE. The site has been inhabited since Neolithic times, during which the Yangshao culture was established in Banpo, in what is now the city's suburbs. Furthermore, in the northern vicinity of modern Xi'an, Qin Shi Huang of the Qin dynasty, China's first emperor, held his imperial court and constructed his massive mausoleum guarded by the Terracotta Army.

Emperor Xuanzong of Tang, personal name Li Longji, was an emperor of the Tang dynasty of China, reigning from 712 to 756. His reign of 44 years was the longest during the Tang dynasty. Through two palace coups, he seized the throne and inherited an empire still in its golden age. He was initially assisted by capable chancellors like Yao Chong, Song Jing and Zhang Yue who were already serving as government officials before Xuanzong ascended the throne. However, under Emperor Xuanzong, the empire reached its turning point and went into sharp decline and near collapse, due to numerous political missteps throughout his long reign, such as over-trusting chancellors Li Linfu, Yang Guozhong and general An Lushan, with Tang's golden age ending in the An Lushan rebellion.