Sharwin was the son of Rustam II. In 986, after the death of Rustam II, Sharwin's brother al-Marzuban ascended the Bavandid throne. There have been several confusions about the reign of the Bavandid kings after the death of Rustam II. In 986, al-Marzuban is no longer mentioned as the ruler of the Bavand dynasty, and Sharwin III is instead mentioned as the ruler of the dynasty. A certain Shahriyar III is later mentioned as the ruler of the Bavand dynasty in the following year. Nothing more is known about Sharwin III.
- Madelung, W. (1975). "The Minor Dynasties of Northern Iran". In Frye, R.N. The Cambridge History of Iran, Volume 4: From the Arab Invasion to the Saljuqs. Cambridge: Cambridge University Press. pp. 198–249. ISBN 978-0-521-20093-6.
- Madelung, W. (1984). "ĀL-E BĀVAND (BAVANDIDS)". Encyclopaedia Iranica, Vol. I, Fasc. 7. London u.a.: Routledge & Kegan Paul. pp. 747–753. ISBN 90-04-08114-3.
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