《容斋随笔·卷一·裴晋公禊事》
但白乐天又有一篇，题为《奉和裴令公三月上已日游太原龙泉忆去岁禊洛之作》，是开成三年诗，那么裴度是开成四年三月才死的。
然乐天又有一篇，题云《奉和裴令公三月上已日游太原龙泉忆去岁禊洛之作》，是开成三年诗，则度以四年三月始薨。
However, Bai Juyi has another article entitled "Offer and Accord with Duke Pei Ling on March Shangsi Day Recalling Last Year's Xi in Luoyang", which is a poem from the third year of Kaicheng. Hence, Pei Du died in March of the fourth year of Kaicheng.