Doquz Khatun was a Turkic

Turkic peoples

The Turkic peoples are peoples residing in northern, central and western Asia, southern Siberia and northwestern China and parts of eastern Europe. They speak languages belonging to the Turkic language family. They share, to varying degrees, certain cultural traits and historical backgrounds...

 Kerait

Kerait

The Kereit tribe was one of the five major tribal confederations in Mongolian plateau in the 12th century, and dominant in the area and, as allies of Genghis Khan, influential in the rise of the Mongol Empire...

 princess of the 13th century, who was married to the Mongol ruler Hulagu

Hulagu Khan

Hulagu Khan, also known as Hülegü, Hulegu , was a Mongol ruler who conquered much of Southwest Asia...

. Their son Abaqa

Abaqa Khan

Abaqa Khan , also Abaga , or Abagha Khan, was the second Mongol ruler of the Persian Ilkhanate. The son of Hulagu Khan and Yesuncin Khatun, he reigned from 1265–1282 and was succeeded by his brother Tekuder Khan...

 succeeded Hulagu upon his death.

She was known to accompany Hulagu on campaigns. At the Sack of Baghdad

Battle of Baghdad (1258)

The Siege of Baghdad, which occurred in 1258, was an invasion, siege and sacking of the city of Baghdad, the capital of the Abbasid Caliphate at the time and the modern-day capital of Iraq, by the Ilkhanate Mongol forces along with other allied troops under Hulagu Khan.The invasion left Baghdad in...

 in 1258, the Mongols massacred tens of thousands of inhabitants, but by the order of Doquz, the Christians were spared.

Doquz Khatun was a Nestorian

Nestorianism

Nestorianism is a Christological doctrine advanced by Nestorius, Patriarch of Constantinople from 428–431. The doctrine, which was informed by Nestorius's studies under Theodore of Mopsuestia at the School of Antioch, emphasizes the disunion between the human and divine natures of Jesus...

 Christian, and is often mentioned as a great benefactor of the Christian faith. When Mongol envoys were sent to Europe, they also tried to use Doquz's Christianity to advantage, by claiming that Mongol princesses such as Doquz and Sorghaghtani Beki

Sorghaghtani Beki

Sorghaghtani Beki or Bekhi , also written Sorkaktani, Sorkhokhtani, Sorkhogtani, Siyurkuktiti; , a Kereyid princess of the Nestorian Christian faith and daughter-in-law of Temüjin , was one of the most powerful and competent women in the Mongol Empire...

 were daughters of the legendary Prester John

Prester John

The legends of Prester John were popular in Europe from the 12th through the 17th centuries, and told of a Christian patriarch and king said to rule over a Christian nation lost amidst the Muslims and pagans in the Orient. Written accounts of this kingdom are variegated collections of medieval...

.

She died in 1265, the same year as her husband.