sentences:  He was killed in action on the same day he was crowned emperor, when Caizhou fell to the allied forces of the Mongol Empire and Southern Song dynasty.Having ruled as emperor for less than a day, or maybe even just a few hours, he holds the record for being the shortest-reigning monarch in Chinese history.Wanyan Chenglin was a descendant of Helibo, the father of Aguda (Emperor Taizu), the founder and first emperor of the Jin dynasty.