What God is the mythical Zhang Tianshi?

Zhang Tianshi is Zhang Daoling.

Zhang Daoling was called Zhang Tianshi by later generations for his extraordinary talent and Taoist thought, which laid a solid foundation for his creation and brought indelible significance to later generations. Zhang Tianshi and Luo Zhenren are two "gods" in Water Margin. "Zhang Tianshi, though young, actually did a good job. He is an additional person and shows himself in many ways, which is very reasonable.

Features:

Zhang Tianshi is often especially loved by the people of past dynasties for two reasons: First, his public morality holds that "loyalty, filial piety and benevolence" and "helping the country and protecting the people" are beneficial to those in power. Since Zhang Daoling initiated Taoism in Han Dynasty, this kind of social morality has been warmly welcomed by those in power. It was named "Shi Tian" and named "Heaven", which has high utilization value and profound mystery.