query: When did Li Deyu serve as chancellor to the Tang Dynasty?
passage: Li Jue (Tang dynasty)
Li Jue (李珏 or 李玨) (784?-852?[1]), courtesy name Daijia (待價), formally Duke Zhenmu of Zanhuang (贊皇貞穆公), was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reigns of Emperor Wenzong and (briefly) Emperor Wenzong's brother Emperor Wuzong. He was considered one of the leaders of the Niu Faction in the Niu-Li Factional Struggles.
passage: Li Lin (Tang chancellor)
Li Lin was born in 694, during the reign of Wu Zetian. He was a member of the imperial Li clan of Tang Dynasty — although he was distant in lineage from the imperial lineage itself. His great-great-great-grandfather Li Qidou (李乞豆) was a younger brother of Li Hu (李虎), the grandfather of Tang's founding emperor Emperor Gaozu, who was the grandfather of Wu Zetian's husband Emperor Gaozong. Li Lin's father Li Jun (李濬) served successively as the prefect of three different prefecture and was known for his honesty. Li Jun died during the "Kaiyuan" era (713–741) of Emperor Gaozong's and Wu Zetian's grandson Emperor Xuanzong while serving as the military governor ("jiedushi") of Jiannan Circuit (劍南, headquartered in modern Chengdu, Sichuan).