This passage introduces the historical evolution and connotation of the ancient legal form known as "Ge." From the Northern and Southern Dynasties to the Yuan Dynasty, "Ge" existed as a legal form, originating from the "Ke" of the Han Dynasty and replacing "Ke" during the Eastern Wei period. During the Sui and Tang Dynasties, "Ge" became one of the four major legal forms, encompassing compilations of imperial decrees issued by the emperor to amend laws or determine penalties, as well as regulations for the daily operations of state institutions. In the Tang Dynasty, "Ge" was divided into two types: "Sanban Ge" and "Liushi Ge," with the Song Dynasty primarily adopting "Liushi Ge." By the Yuan Dynasty, "Ge" replaced "Lü" as the most important legal form, with the "Zhiyuan Xinge" being the first written legal code of the Yuan Dynasty. During the Ming and Qing Dynasties, "Ge" no longer appeared as an independent legal form.