Prince Jing of Yan 燕敬王, personal name Liu Ze 劉澤, was a son of the paternal cousin of Liu Bang 劉邦 (Emperor Gaozu 漢高祖, r. 206-195 BCE), the founder of the Han dynasty 漢 (206 BCE-220 CE). During the years of Liu Bang's war against the hegemonial king Xiang Yu 項羽 Liu Ze was appointed gentleman of the interior (langzhong 郎中). He participated in the campaign against the rebel Chen Xi 陳豨 and was therefore given the title of Marquis of Yingling 營陵侯.
Empress Dowager Lü 呂太后 (r. 188-180) promoted him to the rank of Prince of Yan 燕 but died in the next year (179 BCE). His posthumous title is Prince Jing 敬王. He was succeeded by his son Liu Jia 劉嘉, Prince Kang of Yan 燕康王 (died 152 BCE). The latter's son Liu Dingguo 劉定國 was executed in 130 BCE because he had engaged in hunting without imperial allowance.