Which dynasty is the small square eighteen arhat fan?

Eighteen arhats refer to the eighteen arhats who are immortal and protect the Buddha in Buddhist legends, and come from sixteen arhats plus two venerable ones. They are all historical figures and disciples of Sakyamuni. Sixteen arhats were mainly popular in the Tang Dynasty. Eighteen arhats began to appear at the end of the Tang Dynasty and prevailed in the Song Dynasty. The appearance of eighteen arhats; This may be related to the traditional preference of 18 years old in China culture.