Duke Gong of Cao
Duke Gong of Cao (? – 618 BCE)  was the seventeenth ruler of the vassal State of Cao during the Chinese Spring and Autumn period (770 – 475 BCE).
Born Ji Xiang (姬襄), he was the son of Duke Zhao of Cao.
In 637 BCE, during the exile of Chong’er, son of Duke Xian of Jin, Duke Gong heard that Chong’er suffered from fused ribs and wanted to see for himself.
Chong’er caught Duke Gong spying on him whilst he bathed and described the Duke as a man of “unbelievable rudeness”.
After Chong’er became Duke Wen of Jin and one of the Five Hegemons, in 632 he used Duke Gòng's previous rudeness as an excuse to overthrow the State of Cao.
Duke Gòng was captured by the State of Jin but later released.
After Duke Gong of Cao died in 618 BCE, his son Duke Wen of Cao became ruler.
Duke Dao of Cao
Duke Dao of Cao( 6th century BCE) was the twenty- second ruler of the vassal State of Cao during the Chinese Spring and Autumn period( 770 – 475 BCE).
Born as Jī Wŭ( 姬午), he was the son of Duke Ping of Cao from whom he inherited the throne.
Duke Jing of Song captured Dào in 515 BCE and held him prisoner until his death.
Thereafter, disorder broke out in the State of Cáo as Dào ’s successors, Duke Sheng of Cao and Duke Yin of Cao, were killed one after the other.
Cao Zijing
Cao Zijing( birth and death dates unknown) was a son of Cao Cao, a warlord who rose to power in the late Eastern Han dynasty and laid the foundation for the state of Cao Wei in the Three Kingdoms period of China.
His mother was Lady Li( 李姬), a concubine of Cao Cao.
She also bore Cao Cao two other sons: Cao Zicheng and Cao Zizheng.
Cao Zijing died early and had no son to succeed him.
He was posthumously honoured as" Duke Shang of Ling"( 靈殤公) in 231 by Cao Rui, the second emperor of the Cao Wei state.
Count You of Cao
Count You of Cao( ?–826 BCE) was the seventh ruler of the vassal State of Cao during the Chinese Western Zhou Dynasty( 1046 – 770 BCE).
Born Jī Jiāng( 姬疆), he was the son of Count Xiao of Cao( 曹孝伯) and the younger brother of Count Yi of Cao( 曹夷伯).
Count You was killed by his younger brother Count Dai of Cao( 曹戴伯) in 826 BCE after a nine- year reign.
Duke Mu of Cao
Duke Mu of Cao( 8th Century BCE) was the eleventh ruler of the vassal State of Cao during the Chinese Eastern Zhou Dynasty( 770 – 256 BCE) and Spring and Autumn period.
Born Jī Wǔ( 姬武), he was the son of Cáo Huìbó( 曹惠伯).
In 760 BCE, Duke Mu of Cao killed his elder brother Cáo Fèibó( 曹廢伯/ 曹废伯) and appointed himself ruler of the State of Cao.
He was the first ruler of the State of Cao to receive the posthumous title of" Duke"( 公).
Cao Lin (Prince of Donghai)
Cao Lin( died 5 February 251) was an imperial prince of the state of Cao Wei in the Three Kingdoms period of China.
He was a son of Cao Pi, the first Wei emperor, and the biological father of Cao Mao, the fourth Wei emperor.
Cao Cao
Cao Cao (– 15 March 220), courtesy name Mengde, was a warlord and the penultimate Chancellor of the Eastern Han dynasty who rose to great power in the final years of the dynasty.
As one of the central figures of the Three Kingdoms period, he laid the foundations for what was to become the state of Cao Wei and ultimately the Jin dynasty, and was posthumously honoured as "Emperor Wu of Wei".
He is often portrayed as a cruel and merciless tyrant in subsequent literature; however, he has also been praised as a brilliant ruler and military genius who treated his subordinates like his family.
During the fall of the Eastern Han dynasty, Cao Cao was able to secure the most populated and prosperous cities of the central plains and northern China.
Cao Cao had much success as the Han chancellor, but his handling of the Han Emperor Xian was heavily criticised and resulted in a continued and then escalated civil war.
Opposition directly gathered around warlords Liu Bei and Sun Quan, whom Cao Cao was unable to quell.
Cao Cao was also skilled in poetry, calligraphy and martial arts and wrote many war journals.
Cao Zizheng
Cao Zizheng (died 218) was a son of Cao Cao, a warlord who rose to power in the late Eastern Han dynasty and laid the foundation for the state of Cao Wei in the Three Kingdoms period of China.
His mother was Lady Li (李姬), a concubine of Cao Cao.
She also bore Cao Cao two other sons: Cao Zicheng and Cao Zijing.
As his uncle Cao Shao (曹紹) had no heir, Cao Zizheng was adopted as Cao Shao's son.
In 217, he was enfeoffed as the Marquis of Mei (郿侯).
He died in the following year without a son to succeed him.
In 220, Cao Zizheng's half-brother Cao Pi became the first emperor of the Cao Wei state after usurping the throne from Emperor Xian, the last emperor of the Han dynasty.
The following year, he honoured Cao Zizheng with the posthumous title "Duke Dai of Mei" (郿戴公), and ordered Cao Fan (曹範), a son of Cao Ju, to be Cao Zizheng's heir.
In 222, Cao Pi enfeoffed Cao Fan as the Marquis of Pingshi (平氏侯), but changed his title to Marquis of Chengwu (成武侯) in the following year.
In 229, Cao Pi's successor, Cao Rui, promoted Cao Fan from a marquis to a duke.
Cao Fan died in 235 without a son to succeed him, and was posthumously honoured as "Duke Dao" (悼公).
In 236, Cao Rui ordered Cao Chan (曹闡), Cao Fan's younger brother, to be Cao Fan's heir.
Cao Chan thus became the new Duke of Mei (郿公).
Throughout the reigns of the subsequent Wei emperors, the number of taxable households in Cao Chan's dukedom increased until it reached 1,800.
Cao Zicheng
Cao Zicheng( birth and death dates unknown) was a son of Cao Cao, a warlord who rose to power in the late Eastern Han dynasty and laid the foundation for the state of Cao Wei in the Three Kingdoms period of China.
His mother was Lady Li( 李姬), a concubine of Cao Cao.
She also bore Cao Cao two other sons: Cao Zizheng and Cao Zijing.
Cao Zicheng died early and had no son to succeed him.
He was posthumously honoured as" Duke Shang of Gucheng"( 穀城殤公) in 231 by Cao Rui, the second emperor of the Cao Wei state.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.

Question: What is the date of death of Cao Zizheng's father?
Answer: 15 March 220