|Capital||Merv, later Nishapur|
|- 821||Tahir ibn Husayn|
The Tahirid dynasty (Persian: سلسله طاهریان) was a Persian dynasty that ruled the Abbasid province of Khorasan from 821 to 873. It also ruled the city of Baghdad from 820 until 891. The capital in Khorasan was first located at Merv. Later it moved to Nishapur.
- Bosworth, C. E. (1975), "The Tahirids and Saffarids", in Frye, R. N., The Cambridge History of Iran, Volume 4: From the Arab Invasion to the Saljuqs, Cambridge, UK: Cambridge University Press, p. 91.
- Bosworth, "The Tahirids and Saffarids," p. 91.