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Cao Pi (187 – 29 June 226), formally known as Emperor Wen of Wei, was the first emperor of the state of Cao Wei during the Three Kingdoms period of Chinese history. Born in Qiao County, Pei Commandery (present-day Bozhou, Anhui), he was the second son of the late Han Dynasty warlord Cao Cao. In 220, Cao Pi forced Emperor Xian, last ruler of the Han Dynasty, to abdicate and proclaimed himself Emperor of Wei. Cao Pi continued his father's war against the rival states of Shu Han and Eastern Wu but was unsuccessful. Unlike his father, he concentrated most of his efforts on his home country, which prospered under his rule. Yan Liben (Wade–Giles: Yen Li-pen, c. 600-673), formally Baron Wenzhen of Boling, was a Chinese painter and government official of the early Tang Dynasty. His notable works include the Thirteen Emperors Scroll and Northern Qi Scholars Collating Classic Texts. He also painted the Portraits at Lingyan Pavilion, under Emperor Taizong of Tang, commissioned in 643 to commemorate 24 of the greatest contributors to Emperor Taizong's reign, as well as 18 portraits commemorating the 18 great scholars who served Emperor Taizong when he was the Prince of Qin. Yan's paintings included painted portraits of various Chinese emperors from the Han Dynasty (202 BC-220 AD) up until the Sui Dynasty (581-618) period.