Who is the immortal riding an ass backwards in Crossing the Sea by Eight Immortals?

Zhang. Zhang is the oldest immortal, named "Zhang Guo". Because he is the oldest person, people call him "Zhang".

Zhang Guo actually existed in history, and was recorded as a "Guangzong and Xingzhou native" in Zhang Guo. He was named a fairy during the Kaiyuan period of Xuanzong of the Tang Dynasty (now a native of Zhangguzhai Village, Guangzong County, Hebei Province), and both old and new books were circulated in the Tang Dynasty. When Wu Zetian lived in seclusion, Zhang Guo lived in Zhongtiao Mountain. At that time, everyone said that he had the secret of immortality. He claims to be several hundred years old. Wu Zetian sent messengers to summon him, but Zhang pretended not to go.

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In the twenty-first year of Emperor Xuanzong of the Tang Dynasty, Wei Ji, the secretariat of Hengzhou, played his anecdotes to the emperor. Xuanzong called him, and Zhang Guo pretended to be dead. It took him a long time to wake up, so the messenger was afraid to go forward. Xuanzong heard about it and sent Xu Jiao to invite him, so Zhang Guo had to go to Beijing. It is said that Tang Xuanzong was suspicious of his rumors. He once asked Xing Hepu, who was good at calculating the good and evil of dying young, to tell Zhang's fortune.

I don't know Zhang Jiazi; Another Taoist teacher, Night Light, is good at ghosts. Xuanzong asked him to see Zhang Guo, but he asked, "Where is Zhang Guo?" You can't see it across the street

In Taiping Guang Ji, Zhang calls himself Emperor Yao. When Emperor Xuanzong of the Tang Dynasty asked the warlock Ye Fashan about his origin, Ye Fashan said, "If you dare not say it, you will die." Later, he said, "Zhang Guo was a white bat essence at the beginning of chaos." He fell to the ground dead. After Xuanzong intervened, Zhang Guo saved him.

According to legend, Zhang often carries a Taoist tube and rides an upside-down white donkey to travel around the world, preaching Taoist feelings and persuading people. Later, the folk saying of "riding a donkey to read a song book" came from this. The white donkey he rides travels through Wan Li every day and folds up like paper at night and puts it in a box. When riding during the day, spray water in your mouth and it will return to be a donkey. Later generations wrote a poem: "How many people in the world are like this old man? Instead of riding backwards, everything looks back. "