Question: When did Cao Lin (Prince Of Donghai)'s father die?
Sentence (from "Cao Lin (Prince of Pei)"): In 221, a year after Cao Lin's half- brother Cao Pi usurped the throne from Emperor Xian and became the first emperor of the Cao Wei state, he enfeoffed Cao Lin as the Duke of Qiao( 譙公).
Relevant evidence: No