Defeat of the Da'i al-Hasan ibn al-Qasim at Sariya

In 316 AH the Alid missionary al-Hasan ibn al-Qasim, with Makan ibn Kaki al-Daylami, met Asfar ibn Shiruyah and Mardavij at Sariya. They fought very fiercely, al-Hasan and Makan were routed, and then they rejoined al-Hasan, who was killed. ²

Ibn al-Athir says that most of the Daylam among al-Hasan's men hated him, because he ordered them to be upright and prevented them from wronging the subjects and from drinking wine. They agreed to bring forward Harusandan, one of the chiefs of the Jil, and to hand al-Hasan over to him, and to install Abu al-Husayn ibn al-Atrush. Ahmad al-Tawil learned of this and wrote to al-Hasan, and he took his precautions. ²

The Gregorian conversion is derived from the Hijri year, and it needs an additional source.