Bayazid was the Jalayirid

Jalayirids

The Jalayirids were a Mongol Jalayir dynasty which ruled over Iraq and western Persia after the breakup of the Mongol Khanate of Persia in the 1330s....

 ruler of Soltaniyeh

Soltaniyeh

Soltaniyeh is a city in and capital of Soltaniyeh District of Abhar County, Zanjan Province, Iran. At the 2006 census, its population was 5,684, in 1,649 families. Soltaniyeh, located some to the north-west of Tehran, used to be the capital of Mongol Ilkhanid rulers of Persia in the 14th century....

 (1382-1384) in opposition to his brother Sultan Ahmad

Ahmad (Jalayirids)

Sultan Ahmad was a Jalayirid ruler . He was the son of Shaikh Uvais.-Struggle With His Brothers:Ahmad came to power as a result of a plot against his brother Husain. In 1382 he departed from Ardabil, which he had been given control of, and took Tabriz; Husain was captured and executed...

. He was the son of Shaikh Uvais

Shaikh Uvais

Shaikh Uvais, also known as Uways or Oways , was a Jalayirid ruler of Iraq and Azerbaijan . He was the son of Hasan Buzurg and the Chobanid Delsad Katun.-Life:...

.

In 1382 Bayazid and his brothers Ahmad and Shaikh 'Ali plotted to overthrow their brother Husain

Husain (Jalayirids)

Husain was a Jalayirid ruler . He was the son of Shaikh Uvais.Following the execution of his brother Hasan, the amirs placed Husain on the throne. Almost immediately he had to deal with an invasion by his brother-in-law Shah Mahmud of the Muzaffarids. Shah Mahmud, who was the son-in-law of Shaikh...

. Ahmad acted first, advancing from Ardabil

Ardabil

Ardabil is a historical city in north-western Iran. The name Ardabil probably comes from the Zoroastrian name of "Artavil" which means a holy place. Ardabil is the center of Ardabil Province. At the 2006 census, its population was 412,669, in 102,818 families...

 to Tabriz

Tabriz

Tabriz is the fourth largest city and one of the historical capitals of Iran and the capital of East Azerbaijan Province. Situated at an altitude of 1,350 meters at the junction of the Quri River and Aji River, it was the second largest city in Iran until the late 1960s, one of its former...

 and ordered Husain's execution. Bayazid, who was in Tabriz, barely managed to escape. One of Husain's amirs, 'Adil Aqa, opposed Ahmad and had Bayazid proclaimed as sultan in Soltaniyeh. In order to secure his position Ahmad requested the assistance of the Black Sheep Turkmen; they killed Shaikh 'Ali in battle. Ahmad and Bayazid then attempted to form an agreement with each other; Bayazid was to receive the Jalayirid lands in 'Iraq-i 'Ajam (modern day western Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

) and Ahmad would receive Azerbaijan

Azerbaijan

Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

, while Iraq

Iraq

Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

 would be split between them.

The agreement with the brothers failed to last, however, and Ahmad occupied Baghdad

Baghdad

Baghdad is the capital of Iraq, as well as the coterminous Baghdad Governorate. The population of Baghdad in 2011 is approximately 7,216,040...

. In 1383 he gained entry into Soltaniyeh. At this point, Shah Shuja of the Muzaffarids

Muzaffarids

The Mozaffarids were a family that came to power in Iran following the breakup of the Ilkhanate in the 14th century.-Rise to Power:The Mozaffaris were a family that settled in Khorasan from the beginning of Caliphal rule there. They stayed in Khorasan up until the Mongol invasion of that province,...

 of central Iran intervened, and a new peace was brokered. Bayazid was confirmed in his possession of 'Iraq-i 'Ajam; 'Adil Aqa then left with Shah Shuja for Shiraz

Shiraz, Iran

Shiraz is the sixth most populous city in Iran and is the capital of Fars Province, the city's 2009 population was 1,455,073. Shiraz is located in the southwest of Iran on the Roodkhaneye Khoshk seasonal river...

. 'Adil Aqa's departure left Bayazid without his principal ally, however, and in the spring of 1384 he gave up Soltaniyeh to Ahmad.