《太平广记·卷二百九十五·神五》
文帝元嘉三年的春天，到了赏花之际，忽然看见一双蝴蝶，五彩分明，来到花间飞舞，像燕子那么大。
文帝元嘉三年春，临玩之际，忽见双蝶，五彩分明，来游花上，其大如燕，一日中，或三四往复。
In the spring of the third year of Emperor Yuanjia, Wen, when it was time to enjoy flowers, he suddenly saw a pair of butterflies, with distinct colors, flying among the flowers, as big as swallows.