Ziyadat Allah I (died June 10, 838) was the third Aghlabid

Aghlabid

The Aghlabids were a dynasty of emirs, members of the Arab tribe of Bani Tamim, who ruled Ifriqiya, nominally on behalf of the Abbasid Caliph, for about a century, until overthrown by the new power of the Fatimid.-History:...

 Emir

Emir

Emir , meaning "commander", "general", or "prince"; also transliterated as Amir, Aamir or Ameer) is a title of high office, used throughout the Muslim world...

 in Ifriqiya

Ifriqiya

In medieval history, Ifriqiya or Ifriqiyah was the area comprising the coastal regions of what are today western Libya, Tunisia, and eastern Algeria. This area included what had been the Roman province of Africa, whose name it inherited....

 817 until his death.

Abu Muhammand Ziyadat Allah I succeeded his brother Abdallah I (812–817) to the Emirate of Ifriqiya. During his rule the relationship between the ruling dynasty on the one hand and the jurists and Arab

Arab

Arab people, also known as Arabs , are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing...

 troops on the other remained strained. When Ziyadat Allah I attempted to disband the Arab units in 824, it led to a great revolt at Tunis

Tunis

Tunis is the capital of both the Tunisian Republic and the Tunis Governorate. It is Tunisia's largest city, with a population of 728,453 as of 2004; the greater metropolitan area holds some 2,412,500 inhabitants....

, which was only put down in 836 with the help of the Berbers

Berber people

Berbers are the indigenous peoples of North Africa west of the Nile Valley. They are continuously distributed from the Atlantic to the Siwa oasis, in Egypt, and from the Mediterranean to the Niger River. Historically they spoke the Berber language or varieties of it, which together form a branch...

.

Ziyadat had already begun campaigns in Italy in an attempt to divert the restless Arab troops, and so in 827 there began the conquest of Sicily

Sicily

Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

 from the Byzantine Empire

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

, under the jurist Asad ibn al-Furat

Asad ibn al-Furat

Asad ibn al-Furat was a jurist and theologian in Ifriqiya, who began the Muslim conquest of Sicily.His family, originally from Harran in Mesopotamia, emigrated with him to Ifriqiya. Asad studied in Medina with Malik ibn Anas, the founder of the Malikite school, and in Kufa with a disciple of Abu...

. Although initially repulsed by the Byzantines, they managed to conquer Palermo

Palermo

Palermo is a city in Southern Italy, the capital of both the autonomous region of Sicily and the Province of Palermo. The city is noted for its history, culture, architecture and gastronomy, playing an important role throughout much of its existence; it is over 2,700 years old...

 in 831. Power struggles on the Italian mainland afforded further opportunity for conquest and plunder - a call for aid from the Duke of Naples enabled them to establish a foothold in southern Italy and begin extensive raids against the Christians.

The economic health of the kingdom, in spite of the political unrest, enabled a substantial building programme. The mosque

Mosque

A mosque is a place of worship for followers of Islam. The word is likely to have entered the English language through French , from Portuguese , from Spanish , and from Berber , ultimately originating in — . The Arabic word masjid literally means a place of prostration...

 of Uqba ibn Nafi

Uqba ibn Nafi

Uqba ibn Nafi was an Arab hero and general who was serving the Umayyad dynasty, in Amir Muavia and Yazid periods, who began the Islamic conquest of the Maghreb, including present-day Algeria, Tunisia, Libya and Morocco in North Africa. He was the nephew of 'Amr ibn al-'As. Uqba is often surnamed...

 in Kairuan was renovated and refurnished, and more city defenses were erected.

After the death of Ziyadat Allah I his brother Abu Iqal (838–841) became Emir.