Note 575 — Chapter XLVI · HASAN SUCCEEDS ALY.—ABDICATES IN FAVOUR OF MUAVIA. A.H. XL., XLI. A.D. 661.
Reading edition
We are even told that the promise given by Muâvia to Hasan, namely that the sound of the curse should not fall upon his ears, was not kept.
It is said that Omar II. (A.H. 100) dropped the imprecation; but he was a poor pietist, whose religious scruples led him to make many weak concessions, and even to recognise the claims of the house of Aly. He is of course popular with the Abbassides, who magnify him as a saint of blessed memory, and have invented many wonderful stories to his credit. Weil thinks that this may be one of them; and, at any rate, if suspended during his reign, the curse was resumed immediately on his decease.