The holy shrine was renewed for  the  fourth  time  by  the two brothers, al-Hassan ibn Zaid  who was  the  king  of  Tabristan and Dailarn, nicknamed " al-Dai' al-Kabeer", and  Mohammed ibn Zaid,  nicknamed "al-Dai' al-Sagheer".

Both brothers were also known as the fetchers of stones and are descendants of Imam Hassan ibn Ali ibn Abi jalib (A. S.). They built a tomb over the grave and surmounted by a lofty dome built of clay brick and gypsum.

Around this building, two sheds surrounded by a wall were also built and used as a mosque.  This building was completed in 283 A. H. (896 A. D.).

Source:

- Holy Shrines of Karbala: By Raouf Mohamed Ali Al-Ansari

[P. 120].