Za Dynasty

The Za Dynasty or Zuwa Dynasty were rulers of a medieval kingdom based in the towns of Kukiya and Gao on the Niger River in what is today modern Mali. The Zarma people of Niger are believed to be the descendants of the "Zas" from which they derive their name "Zarma", which means "the descendants of Za". 
Oral history and the "Tarikh al-Sudan".
Al-Sadi's seventeenth century chronicle, the "Tarikh al-Sudan", provides an early history of the Songhay as handed down by oral tradition. The chronicle reports that the legendary founder of the dynasty, Za Alayaman (also called Dialliaman), originally came from the Yemen and settled in the town of Kukiya. The town is believed to have been near the modern village of Bentiya on the eastern bank of the Niger River, north of the Fafa rapids, 134 km south east of Gao. Tombstones with Arabic inscriptions dating from the 14th and 15th centuries have been found in the area. Kukiya is also mentioned in the other important chronicle, the "Tarikh al-fattash". The "Tarikh al-Sudan" relates that the 15th ruler, Za Kusoy, converted to Islam in the year 1009-1010 A.D. At some stage the kingdom or at least its political focus moved north to Gao. The kingdom of Gao capitalized on the growing trans-Saharan trade and grew into a small regional power before being conquered by the Mali Empire in the early 13th century.
Rulers of the Za dynasty as given in the "Tarikh al-Sudan".
These names with their diacritics are as given in the translation by John Hunwick. The surviving Arabic manuscripts differ both in the spelling and the vocalization of the names. 