 Altogether the Cao family, especially Cao Cao's fourth son, Cao Zhi, in association with other poets helped to form the "Jian'an" style.Cao Zhi is also noted for his association with the dramatically composed and life-saving poem known as "The Quatrain of Seven Steps".Cao Pi wrote an essay "Seven Scholars of Jian'an" which was influential in the development of the "Jian'an" school of poetry.