What is the writing background (time and place) of "Eight Autumn Poems (Part 1)", "Ode to Ancient Relics (Part 3)", and "Ascending"?

The ancients had the custom of climbing on the Double Ninth Festival. This poem was written on the Double Ninth Festival in 767.

At that time, the Anshi Rebellion had been over for four years, but local warlords took advantage of the situation and began to compete with each other for territory.

Du Fu was 56 years old at the time, living in Kuizhou on the Yangtze River, and was seriously ill. His friends Li Bai, Gao Shi, and Yan Wu passed away one after another. At this time, Du Fu was living in embarrassment and suffering from illness.

It also happened to be the Double Ninth Festival, so he invited a distant relative, Wu Lang, to have a drink, but he didn't want Wu Lang to miss it due to something else.

He climbed to the top of the mountain due to illness.

The autumn wind rustles, thousands of trees wither, the river flows eastward, lonely birds circle, and apes can be heard chirping.

Du Fu was filled with emotion, climbed high alone, and wrote this seven-character poem that was filled with sadness at the scene.

It is known as "the first of Du Ji's seven-character rhymed poems" and "the best of ancient and modern rhymed poems".