Yī Jí appellation Jībó, was a Shānyáng man. When young he joined his fellow townsman General Defending the South Liú Biǎo. When Xiān-zhǔ [Liú Bèi] was at Jīngzhōu, Jí often went to visit him. When Biǎo died, he followed Xiān-zhǔ south across the Jiāng, and then followed into Yìzhōu.

After Yìzhōu was settled, Jí was appointed Assistant Internal Cadet to the General of the Left, and received rank second only to Jiǎn Yōng, Sūn Qián, and the rest.

He was sent east as envoy to Wú. Sūn Quán had heard of he was skilled in debate, and wished to debate and defeat him. Jí entered and bowed. Quán said: “Why do you toil for an unworthy lord?” Jí immediately replied: “A bow and a rise is not enough to be considered toil.” Jí’s quick thinking was all of this sort. Quán was deeply impressed.

Later he was promoted General Manifesting Culture, and with Zhūgě Liàng, Fǎ Zhèng, Liú Bā, and Lǐ Yán together composed the Shǔkē. The system of the Shǔkē “Shǔ Administrative Code” was due to these five men.

伊籍字機伯，山陽人。少依邑人鎮南將軍劉表。先主之在荊州，籍常往來自託。表卒，遂隨先主南渡江，從入益州。益州既定，以籍為左將軍從事中郎，見待亞於簡雍、孫乾等。遣東使於吳，孫權聞其才辯，欲逆折以辭。籍適入拜，權曰：「勞事無道之君乎？」籍既對曰：「一拜一起，未足為勞。」籍之機捷，類皆如此，權甚異之。後遷昭文將軍，與諸葛亮、法正、劉巴、李嚴共造蜀科；蜀科之制，由此五人焉。