What's the name of the Buddha in the Old Nine Gates?

The name of the Old Nine-door Buddha is Zhang Qishan. The head of the Old Nine Doors, known as Lord Zhang Foye, is the grandson of the previous generation, the head of the Three Doors, and a descendant of the Zhang family mixed among the common people.

A brief account of Lao Jiumen's plot

Zhang Qishan met several strangers in the town. They inquired about the train and asked why they came here. Zhang Qishan learned that they came here to do odd jobs to make a living, but when asked about the train, these people kept their mouths shut and hurried back to their rooms to sleep.

Think their behavior is abnormal, and when sleeping, the shoes beside the bed are neatly placed, which looks like they are ready to leave at any time, so they stay alert and have a rest with Qi Tiezui and Zhang's adjutant. Early the next morning, the three outsiders quietly left, and Zhang Qishan and others immediately followed them and chased them into the dense fog.

Unexpectedly, they hid their whereabouts in the fog and made a sneak attack on Zhang Qishan and them. Thanks to Zhang Qishan's superb martial arts, they subdued the three men and concluded that they must have something to do with the train case. But when Zhang Qishan extorted a confession from them, they swallowed the poison hidden in their mouths in advance.