When did the calligraphy banner start?

Calligraphy was written horizontally from the beginning, so Zhong Dingwen Qin calligraphy in the Western Zhou Dynasty was one of the flag formats.

The vertical amplitude appeared in the later period, which began in the inscription era. Such as Qin tablet, Weibei tablet, Sui and Tang tablet, etc.

These forms appeared earlier than those embodied in paper writing materials.