Poet sage is a title of respect for Du Fu, a poet in Tang Dynasty. Du Fu is famous for his poems. His poems truly describe the sufferings of the lower classes, expose the darkness and decay of the society at that time, and reflect his thoughts of worrying about the country and the people in them with a gloomy style, showing the poet's deep patriotic feelings and fraternity thoughts. So his poems are called the history of poetry, and his people are respected as poets.