Li Tai
Meanwhile, Li Tai's staff member Su Xu (蘇勖) suggested to him that, like the talented princes in past dynasties, he should commission a major literary work, so Li Tai commissioned the work "Journal of Geography" ("Kuodi Zhi") and retained the officials Xiao Deyan (蕭德言), Gu Yin (顧胤), Jiang Yaqing (蔣亞卿), and Xie Yan (謝偃) to head the project. Initially, the work was drafted at Chang'an, and his staff scholars received so many visitors among the noble youths that they were distracted from their work. Li Tai saw that their time was not being productive, and so sent them out to the field—the various prefectures—to collect data and write. It took four years for Li Tai's scholars to complete the work, which had 550 volumes. The work was completed in 642, and Emperor Taizong rewarded Li Tai with a large supply of silk. By this point, Li Tai's staff was growing so large that the imperial stipend to Li Tai exceeded that to Li Chengqian. The official Chu Suiliang suggested to Emperor Taizong that this was improper, and Emperor Taizong agreed—but rather than reducing Li Tai's stipend, he removed all limits on Li Chengqian's spending, which led to Li Chengqian, who was already wasteful in his lifestyle, to be even more wasteful. Emperor Taizong also had Li Tai move to Wude Palace (武德殿), next to Li Chengqian's palace—an action that Wei Zheng considered inappropriate, and so Emperor Taizong reversed.