Muhammad ibn Ziyad was a descendant of Yazid, younger brother of the first Umayyad caliph Muawiyah I.^[1] In 814 he was arrested and brought to the Abbasid caliph al-Ma'mun on account of his ancestry, but his life was spared in the end. He was merely placed under surveillance and became the protégé of the caliph's minister al-Fadl ibn Sahl.^[2] Three years later a letter from the governor of Yemen arrived to Baghdad, complaining about attacks by the Ash'arite and Akkite tribes. Al-Fadl recommended that al-Ma'mun send the capable Muhammad ibn Ziyad to Tihamah in order to suppress the tribes. The situation was particularly critical since the Alids under a leader called Ibrahim al-Jazzar threatened to detach Yemen from Abbasid control at this time. Muhammad ibn Ziyad was a sworn enemy of the Alids, which made him a suitable choice for the task.^[3] After performing the hajj, Muhammad marched south to Yemen with an army of Khurasani soldiers and arrived there in 818. He fought numerous battles against the tribes and won control over the Tihama lowland in the next year.^[4]

Following his victories, Muhammad was appointed amir of Yemen by al-Ma'mun with the task to restrain 'Alid Shi'a influence.^[5] Muhammad established a new city, Zabid, as his capital. It was built in a circular shape and situated midway between the sea and the mountains. He was able to expand his influence into Hadramawt and parts of highland Yemen, all the while recognizing Abbasid overlordship.^[6] The historian Umara enumerates his possessions as including Hadramawt, Diyar Kindah, Shihr, Mirbat in Oman, Abyan, Lahij, Aden and the maritime provinces as far north as Hali, as well as Janad, Mikhlaf al-Ma'afir, Mikhlaf Ja'far, San'a, Sa'dah, Najran, and Bayhan in the highlands.^[7] However, the sources are somewhat obscure since the historian al-Hamdani asserts that another family, Banu Shurah, exercised paramount power in the Tihama for parts of the ninth century and were established in Zabid. From other sources it appears that San'a in fact continued to be governed by an Abbasid governor up to 847.^[8]

Little is known about the economic structure of the Ziyadid realm, but the historian Umara writes that the dynasty was bolstered by the flourishing international trade. The ruler received duties from ships coming from India. From the east came luxury products such as musk, camphor, ambergris, sandalwood and porcelain. From Africa came Ethiopian and Nubian slaves via the Dahlak Archipelago. Umara also mentions taxes on ambergris collection at Bab al-Mandab and the south coast, and on pearl fishing.^[9]

Meanwhile, Abbasid rule in Arabia was declining. After the violent end of caliph al-Musta'in in 866, the second Ziyadid ruler, Ibrahim ibn Muhammad, kept the tax revenues for himself and adopted royal trappings. He nevertheless continued reciting the khutba in the name of the Abbasids. As the Ziyadids' power tended to be concentrated on the lowland, and the Abbasid governors in the highland lacked support from their home base in Iraq, other dynasties were established. The Yufirids established an independent state in San'a in 847 and forced the Ziyadid ruler to tolerate their rule in exchange for mentioning him on coins and in the Friday prayer. An imam of the Shi'ite Zaydiyyah sect, al-Hadi ila'l-Haqq Yahya established a power base in the northern highlands in 897; it was the beginning of the Yemeni imamate that endured until 1962. Furthermore, the late ninth and early tenth centuries saw a great deal of agitation by Ismaili figures who adhered to the Fatimid imam (whose descendants were later to become caliphs in Egypt). Zabid itself was sacked by the sectarian Qarmatians, an Ismaili branch, in 904.^[10]

In 904 the Isma'ilis under Ibn Hawshab and Ali ibn al-Fadl al-Jayshani invaded Sana'a. The Yufirid emir As'ad ibn Ibrahim retreated to Al-Jawf, and between 904 and 913, Sana'a was conquered no less than 20 times by Isma'ilis and Yufirids.^[11] As'ad ibn Ibrahim regained Sana'a in 915. Yemen was in turmoil as Sana'a became a battlefield for the three dynasties, as well as independent tribes.

Under the lengthy reign of Abu'l-Jaysh Ishaq (r. 904–981), the Ziyadid dynasty experienced a temporary revival. However, when Abu'l-Jaysh grew old the outer regions began to fall away from Ziyadid rule. Towards the end of his reign the area between Aden and ash-Sharjah remained under his control.^[12] Even as late as 976, the royal revenues amounted to a million gold dinars.^[13]

The Yufirids again attacked in 989 and burnt Zabid.^[14] However, the Mamluk al-Husayn bin Salamah managed to save the kingdom from complete collapse. He defeated the mountain tribes and restored the Ziyadid realm to its old limits. Al-Husayn was remembered as a just and high-spirited regent who dug wells and canals and constructed roads across the kingdom. He governed until his peaceful demise in 1012.^[15] The back side of the coin was that the Ziyadid monarchs lost effective power after 981 while a succession of Mamluks held real power, which at length made for political turmoil. After al-Husayn's death, his slave, the eunuch Marjan, held power as wazir. He in turn raised two Ethiopian slaves called Nafis and Najah who received high offices in the state. According to Kamal Suleiman Salibi, the last Ziyadi ruler was murdered in 1018 and replaced by Nafis.^[16] Nafis adopted royal titles but was immediately challenged by Najah, who defeated Nafis and Marjan and founded the Najahid dynasty in 1022.

(This list follows H.C. Kay, Yaman: Its early medieval history (London 1892). A deviant list is published in Clifford Edmund Bosworth, The new Islamic dynasties (Columbia University Press 1996), p. 99, with the following names and dates: Muhammad bin Ziyad 818–859, Ibrahim bin Muhammad 859–896, Ziyad bin Ibrahim 896–902, Ibn Ziyad 902–911, Abu'l-Jaysh 911–981, etc.)

1. Muhammad ibn Ziyad (818-859)
2. Ibrahim ibn Muhammad (859-902), son
3. Ibn Ziyad (902-904), son
4. Abu'l-Jaysh Ishaq ibn Ibrahim (904-981), brother
5. 'Abdallah or Ziyad ibn Ishaq (981-c. 1012), son
6. Ibrahim or 'Abdallah (c. 1012–1018), kinsman

• List of Sunni Muslim dynasties
• History of Yemen
• Islamic history of Yemen
• House of Bolkiah (Sultan of Brunei)

• Stookey, Robert W., Yemen: The politics of Yemen Arab Republic (Boulder 1978).
• "Ziyadid Dynasty." Encyclopædia Britannica. 2006. Encyclopædia Britannica Online. 14 Apr. 2006 <http://search.eb.com/eb/article-9078412>.