Cao Pi was born in 187 to Cao Cao and one of his favorite concubines, Lady Bian.
At the time of Cao Pi's birth, Cao Cao was a mid-level officer in the imperial guards in the capital Luoyang, with no hint that he would go on to the great campaigns he eventually carried out after the collapse of the imperial government in 190.
In the period after 190 when Cao Cao was constantly waging war, it is not known where Cao Pi and his mother Lady Bian were, or what their activities were.
The lone reference to Cao Pi during this period was in 204, when he took Yuan Xi's wife Lady Zhen as his wife.
(Lady Zhen gave birth to Cao Pi's eldest son Cao Rui only eight months later—which created murmurs that Cao Rui might have been biologically Yuan Xi's son and not Cao Pi's, although the possibilities appeared farfetched.)
The next immediate reference to Cao Pi's activities was in 211, when he was commissioned to be commander of the imperial guards and deputy prime minister.
This position made him assistant to his father, who was then prime minister and effectively in control of the imperial government.
His older brother Cao Ang had died earlier, and Cao Pi is now the oldest son of Cao Cao.
Futher, his mother Lady Bian is now Cao Cao's wife (after Cao Ang's adoptive mother, Cao Cao's first wife Lady Ding, was deposed), thus making Cao Pi the presumptive heir to Cao Cao.
However, his status as heir is not immediately made legal, and for years there are lingering doubts on whom Cao Cao intends to make heir.
Cao Cao greatly favors Cao Zhi, a younger son of his also by Lady Bian, who is known for his literary talents.
Both Cao Pi and Cao Zhi are talented poets, but Cao Zhi is more highly regarded as a poet and speaker.
By 215, the brothers were in concord on the surface but each had his own set of associates fighting each other under the surface.
Initially, Cao Zhi's party appears to be prevailing, and in 216 they are successful in falsely accusing two officials supporting Cao Pi—Cui Yan and Mao Jie.
Cui is executed, while Mao is deposed.
However, the situation shifts after Cao Cao receives advice from his strategist Jia Xu, who concludes that changing the general rules of succession (primogeniture) would be disruptive—using Yuan Shao and Liu Biao as counterexamples.
Cao Pi is also burnishing his image among the people and creates the sense that Cao Zhi is wasteful and lacking actual talent in governance.
