 Cao Cao was also the father of the well-known poets Cao Pi and Cao Zhi.Cao Pi is known for writing the first Chinese poem using seven syllables per line (七言詩), the poem "燕歌行".Cao Zhi demonstrated his spontaneous wit at an early age and was a front-running candidate for the throne; however, such ability was devoted to Chinese literature and poetry, which was encouraged by his father's subordinate officials.