The author of Lisao is a poet, politician (thinker) of Chu State during the Spring and Autumn Period and the Warring States Period, the founder of Chu Ci and the founder of China's romantic poetry.
The Spring and Autumn Period and the Warring States Period are listed as an "era" in the history of China, so it is unreasonable to separate them according to this topic here.
According to the meaning of the title, it is obvious that the author of Li Sao is Qu Yuan, so the last blank should not be filled with the author's name "Qu Yuan", but should be filled with the identity corresponding to the politician, and Qu Yuan is indeed a great "thinker" in China history, so the appropriate lyrics should be (thinker).