The signature and seal cannot be clearly seen (it would be better to take a clearer picture), so I don’t know who the author is.
The content of the writing is -
Xia Fang does not allow tribute to rare things, and the secret edict only teaches the cultivation of lychee (twigs).
Wuhan and Wu competed for the peach, but Fang Shuo was ordered to steal the child in vain.
————Poetry of Tang Dynasty Han Xi