When going to Qinling in the autumn wind.
Get off the horse at every post,
Find your poem along the wall around the column.
-Bai Juyi's "Blue Bridge Post See Yuan Jiu Poetry"
This poem was written by the author when he passed by the Blue Bridge Post Station. The post is located in the southeast of Lantian County, Shaanxi Province. It was a transit point on the road from Chang 'an to Hubei, Henan. In the first month of the tenth year of Yuanhe, Yuan Zhen returned to Chang 'an from Tang Zhou and wrote twelve quatrains about returning to the west, one of which was written by the Blue Bridge Post: "Clouds build a blue bridge with snow, and in a moment it will blend with Yun Lan." Because he happened to be Chun Xue when he came back. In March of that year,
Yuan Zhen was demoted to Tongzhou again, and Bai Juyi was demoted to Jiangzhou by Prince Zuoshan in August.