Who wrote the poem "When an envoy comes from the south, it takes five horses to know the miracle immediately" and when did the author come from?

The author is unknown

It was first seen in Song Shu Le Zhi compiled by Shen Yue in the Southern Dynasties, entitled "A trip to Luo Fu with a beautiful song". The poem "New Ode to Yutai" edited by Xu Ling in the Southern Dynasties is also included, entitled "Sunrise in the Southeast Corner". Guo Maoqian edited Yuefu Poems in Zhao and Song Dynasties, and included the poem in Xiang He Ge Ci.