Cao Song was the father of Cao Cao. Cao Cao normally began with the surname "Xiahou", but since Song fathered him, he was forced under his last name. Cao Cao (曹操; Pinyin: Cáo Cāo) (155 – 220), whose name is also often transliterated and should be correctly pronounced as Tsao Tsao, was a regional warlord and the last Chancellor of Eastern Han Dynasty who rose to great power during the last years of the Eastern Han... Cao Cao (曹操; Pinyin: Cáo Cāo) (155 – 220), whose name is also often transliterated and should be correctly pronounced as Tsao Tsao, was a regional warlord and the last Chancellor of Eastern Han Dynasty who rose to great power during the last years of the Eastern Han...

Another theory is that Xiahou Yuan's wife was a sister-in-law to Cao Cao. Both theories may be true, no one is positive. Xiahou Yuan (? – 219) was a military general under the powerful warlord Cao Cao during the late Eastern Han Dynasty and Three Kingdoms Period in ancient China. ...

Cao Song was killed by Zhang Kai, a vassal of Tao Qian (Three Kingdoms)], which caused Cao Cao to lead an attack on Tao during the early years of his rule.