 Complete the following phrase:  Du Wei was from Fu County 涪縣, Zitong Commandery 梓潼郡, which is in present-day Mianyang, Sichuan. He was born sometime in the mid- or late Eastern Han dynasty. In his younger days, he studied under the tutelage of Ren An 任安; 124202, a famous scholar and polymath. Liu Zhang, the Governor of Yi Province covering present-day Sichuan and Chongqing, heard about Du Wei and offered him the position of an Assistant Officer 從事 in the provincial government. However, Du Wei claimed that he was ill and declined the offer. In 214, after the warlord Liu Bei 