Year 930 (CMXXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.
- Hajj – Qarmatians led by Abu Tahir al-Jannabi sack Mecca, desecrating the Zamzam Well and carrying off the Black Stone.
- Mardavij ibn Ziyar is sent by Asfar ibn Shiruya along with his brother Shirzad, to capture the fortress of Shamiran in Tarom (Northern Iran), the capital of the Sallarid ruler Muhammad ibn Musafir. During the siege Mardavij is persuaded to revolt against Asfar, by letters from Makan ibn Kaki. With the help of the sons of the Sallarid, he kills other members of his tribe, including Shirzad. Mardavij founds the Ziyarid Dynasty and becomes the ruler of Asfar's former territories, which includes Rey, Qazvin, Zanjan, Abhar, Qom and Karaj.