Lord Dunsany 
The Relenting of Sarnidac [EPUB ebook] 

And the Book of the Knowledge of the gods tells further how the day on which Pompeides found the gods shall be kept for ever as a fast until the evening and called the Fast of the Departing, but in the evening shall a feast be held which is named the Feast of the Relenting, for on that evening Sarnidac pitied the whole world and tarried.