Cui Yan
Cui Yan was from Dongwucheng County (), Qinghe Commandery, Ji Province, which is around present-day Gucheng County, Hebei. He was born in the Cui family of Qinghe Commandery, a political family which rose to prominence during the Sui and Tang dynasties later. In his youth, he was known to be plain, dull and lacking in communication skills, but he was very interested in swordsmanship and military arts. When he was 22 years old, he was nominated by the local district office to be a judicial officer, for which he was so grateful that he started reading books such as the "Analects" and "Han Shi" ()