|Cao Gan / Cao Liang|
曹幹 / 曹良
|Prince of Zhao (趙王)|
|Tenure||232 – 14 September 261|
|Prince of Julu (鉅鹿王)|
|Tenure||226 – 232|
|Prince of Lecheng (樂城王)|
|Tenure||224 – 226|
|Prince of Hejian (河間王)|
|Tenure||222 – 224|
|Duke of Yan (燕公)|
|Tenure||221 – 222|
|Died||[b]14 September 261 (aged 47)|
|House||House of Cao|
Cao Gan was a son of Cao Cao, a warlord who rose to prominence towards the end of the Han dynasty and laid the foundation for the Cao Wei state. His birth mother was Lady Chen (陳妾), a concubine of Cao Cao, but he was raised by Lady Wang (王夫人), another of Cao Cao's concubines, because Lady Chen died early.
In 215, Cao Gan was enfeoffed as the "Marquis of Gaoping Village" (高平亭侯) by Emperor Xian, the figurehead emperor of the Han dynasty. In 217, his title was first changed to "Marquis of Lai Village" (賴亭侯) and then to "Marquis of Hongnong" (弘農侯) within the same year. When Cao Cao was critically ill in early 220, he told his heir apparent Cao Pi, "This boy was only three years old when his mother died. Now, he's going to lose his father too when he's just five years old. Please take good care of him." Cao Pi followed his father's dying wish and treated Cao Gan and his other half-brothers kindly. The young Cao Gan often called Cao Pi "aweng" (阿翁; an affectionate way of addressing one's father, grandfather or an older man) but Cao Pi corrected him, "I am your elder brother." Cao Pi was often moved to tears when he saw how Cao Gan looked up to him like a father.
In 220, Cao Pi usurped the throne from Emperor Xian, ended the Han dynasty, and established the Cao Wei state with himself as the new emperor. A year later, he enfeoffed his half-brother Cao Gan as the Duke of Yan (燕公). In 222, he promoted Cao Gan from a duke to a prince under the title "Prince of Hejian" (河間王). Cao Gan's title was later changed to "Prince of Lecheng" (樂城王) in 224, and then to "Prince of Julu" (鉅鹿王) in 226.
In 232, Cao Pi's successor, Cao Rui, changed Cao Gan's title to "Prince of Zhao" (趙王). In 234, someone reported Cao Gan to the imperial court for violating imperial protocol by privately hosting guests without authorisation. Although Cao Rui did not punish Cao Gan for the infringement, he issued an imperial decree to reprimand Cao Gan for his conduct.
Throughout the later reign of Cao Rui to the reigns of the subsequent Wei emperors (Cao Fang and Cao Huan), the number of taxable households in Cao Gan's princedom increased until it reached 5,000. Cao Gan died on 14 September 261 during the reign of Cao Huan, the last Wei emperor.
- The Weilue mentioned that Cao Gan was five years old (by East Asian age reckoning) when Cao Cao died in 220, so by this account, Cao Gan's birth year was 216. However, Pei Songzhi pointed out that Cao Gan was 20 years younger (by East Asian age reckoning) than Cao Biao. Since Cao Biao was born in 195, Cao Gan must be born in 214. The 214 birth year makes more sense than the 216 birth year because, according to the Sanguozhi, Cao Gan was enfeoffed as a marquis in 215, thus he could not have been born in 216.
- The Sanguozhi stated that Cao Gan died on the wuyin (戊寅) day of the 8th month in the 2nd year of the Jingyuan era (260-264) in Cao Huan's reign. This date corresponds to 14 September 261 in the Gregorian calendar.
- The Weilue recorded his name as "Cao Liang" instead of "Cao Gan".
- (良年五歲而太祖疾困， ...) Weilue annotation in Sanguozhi vol. 20.
- (臣松之案：此傳以母貴賤為次，不計兄弟之年，故楚王彪年雖大，傳在幹後。尋朱建平傳，知彪大幹二十歲。) Pei Songzhi's annotation in Sanguozhi vol. 20.
- ([景元二年]八月戊寅，趙王幹薨。) Sanguozhi vol. 4.
- (魏略曰：幹一名良。良本陳妾子，良生而陳氏死，太祖令王夫人養之。) Weilue annotation in Sanguozhi vol. 20.
- (武皇帝二十五男： ... 王昭儀生趙王幹， ...) Sanguozhi vol. 20.
- (趙王幹，建安二十年封高平亭侯。二十二年，徙封賴亭侯。其年改封弘農侯。) Sanguozhi vol. 20.
- (... 遺令語太子曰：「此兒三歲亡母，五歲失父，以累汝也。」太子由是親待，隆於諸弟。良年小，常呼文帝為阿翁，帝謂良曰：「我，汝兄耳。」文帝又愍其如是，每為流涕。) Weilue annotation in Sanguozhi vol. 20.
- (黃初二年，進爵，徙封燕公。) Sanguozhi vol. 20.
- (三年，為河間王。五年，改封樂城縣。七年，徙封鉅鹿。) Sanguozhi vol. 20.
- (太和六年，改封趙王。 ... 青龍二年，私通賔客，為有司所奏，賜幹璽書誡誨之，曰：「易稱『開國承家，小人勿用』， ... 稱朕意焉。」) Sanguozhi vol. 20.
- (景初、正元、景元中，累增邑，并前五千戶。) Sanguozhi vol. 20.