The calligraphy of that dynasty has oblique characters.

The inclination of Chinese characters does not reflect the dynasty, but at best represents the writer's writing style and habits, which is closely related to the background, writing season, place and materials at that time. The specific age and trend depends on the stroke changes of the book style and whether the characteristics of ancient inscriptions (pre-book style) are cited, so as to reach the final conclusion. Hope to adopt, thank you!