Short answers, pulled from the story.
Li Longji, known as Emperor Xuanzong of Tang, was born in 685 at the eastern capital Luoyang. He spent years confined within palace walls alongside his brothers and cousins until 699 when they were allowed to leave.
Emperor Xuanzong took the throne on the 8th of September 713 after convening a meeting with General Wang Maozhong and eunuch Gao Lishi. They executed several allies of Princess Taiping, forcing Dou Huaizhen to commit suicide and ordering Xue Ji to take his own life before Emperor Xuanzong ordered her to commit suicide at home.
Zhang Jiazhen switched from conscription to a recruitment-based system where soldiers received salaries while Tang northern border defense forces totaled about 600,000 men reduced by 200,000 in 722. By 742 main Tang forces concentrated on nine different military circuits plus one special district called Lingnan alongside three coast defense districts named Changle, Donglai, and Dongmou.
Gao Xianzhi expanded Tang power westward into the Xiyu region before battling Abbasid forces at Talas in 751 resulting in a major defeat for Tang. This battle ended western expansion and caused several tributaries to turn toward the emerging Abbasid Caliphate.
An rebelled in winter 755 after Yang Guozhong provoked him by surrounding his mansion at Chang'an and executing staff members. On the 14th of July 756 Emperor Xuanzong abandoned Chang'an and fled with Gao Lishi, Yang Guozhong, Wei, Li Heng, Consort Yang, and her family.
Emperor Xuanzong died on the 3rd of May 762 while living in a depressed state after being forcibly moved back to the main palace. He became depressed, rarely ate meat, quickly fell ill, and died without ever regaining full control over imperial affairs.