Why is the Xuanmiao Temple in Jingzhou also known as the Jiulao Xiandu Palace?

The Xuanmiao Temple in Jingzhou is located on Jingbei Road in the ancient city of Jingzhou. It was originally built during the Tang Dynasty but was later destroyed in wars. The existing buildings were rebuilt in the 12th year of the Wanli period of the Ming Dynasty (1584 AD). The remaining three structures are the Jade Emperor Pavilion at the front, the Three Heavens Gate in the middle, and the Xuanwu Pavilion (also known as the Zihuang Hall) on the elevated platform at the back, all rebuilt in the 12th year of the Wanli period of the Ming Dynasty (1584 AD). According to the 'Jiulao Xiandu Palace Stele' inside the temple (this stele is the earliest stele visible in the Jianghan Plain, with the inscription written by the famous Yuan Dynasty scholar Ouyang Yuan and the calligraphy by the renowned Yuan Dynasty calligrapher Wei Su), it is said that this place is dedicated to the ninth immortal, Tang Dongyun. So, why was Tang Dongyun conferred as the ninth immortal? Tang Dongyun (Daoist name Xuanjing Zhenren) was born into an official family in the Song Dynasty in Jiangling. At the age of 15, despite his father's opposition, he entered the Xuanmiao Temple and became a Daoist novice, dedicating himself to rigorous cultivation and self-discipline. After learning Daoism, Tang Dongyun devoted himself to seeking alms, traveling thousands of miles to collect donations, which he used to renovate the Xuanmiao Temple. His compassionate spirit was recognized by Emperor Shundi of the Yuan Dynasty, who conferred him the title of the ninth immortal. According to local chronicles, the name Xuanmiao Temple originates from the characteristics of the word 'Dao' in the Dao De Jing: 'The gateway to all mysteries.' The architectural prototype of the Xuanmiao Temple we see today was preserved from the Yuan Dynasty. After Tang Dongyun was conferred as the 'ninth immortal,' the Xuanmiao Temple was renamed 'Jiulao Xiandu Palace' at that time, and later it was renamed back to 'Xuanmiao Temple.'