to in history: That five-year and four-year imprisonment terms were abolished, and one-year terms instituted. That those who used witchcraft to harm others would have a goat tied to his or her back and a dog tied to the chest and thrown into a river. That a sufficiently high-ranked official who committed a crime would be allowed to forgo his office in lieu of punishment. That if a pregnant women were sentenced to death, she would be allowed to bear her child and be executed 100 days after giving birth. That each governmental agency would have a drum next to its front door, so that those who believed that they had been unfairly punished could pound the drum and make their requests. In 439, Emperor Taiwu, even though by this point he had taken Juqu Mengxun's daughter as a concubine and had married his sister Princess Wuwei to Juqu Mengxun's son and successor Juqu Mujian, became resolved to conquer Northern Liang, and Cui greatly encouraged him, despite opposition from other key officials, including Li Shun, Daxin Jin (達奚斤), and Tuxi Bi (吐奚弼). (Why Li switched his position from supporting a campaign to opposing it at this point was unclear, but Cui would later accuse him of having accepted bribes from Juqu Mengxun and Juqu Mujian.) Li and Tuxi argued that Northern Liang's territory was desolate, and that the Northern Wei army would run out of food and water. Emperor Taiwu followed Cui's suggestion, and was able to quickly conquer Northern Liang and force Juqu Mujian's surrender—and when he saw that the region around Northern Liang's capital Guzang (姑臧, in modern Wuwei, Gansu) was exceptionally fertile, he became very resentful of Li, and would eventually force Li to commit suicide in 442. Meanwhile, after the conquest of Northern Liang, at Cui's request, Juqu Mujian's officials Yin Zhongda (陰仲達) and Duan Chenggen (段承根) were added to Cui's staff of historians. He also added Gao Yun to his staff around this time. In 442, at Kou Qianzhi's urging, Emperor Taiwu ascended a platform and formally received Taoist amulets from Kou, and changed the color of his flags to blue, to show his Taoist beliefs and to officially approve Taoism as the state religion. From that point on, it became a tradition for Northern Wei emperors, when they took the throne, to receive Taoist amulets. Also at Kou and Cui Hao's urging, he started