Hulegu Khan, was a Mongol ruler who conquered much of West Asia. As a son of Tolui and the Keraite princess Sorghaghtani Beki, he was a grandson of Genghis Khan and brother of Ariq Boke, Mongke Khan, and Kublai Khan. Hulegu's army greatly expanded the southwestern portion of the Mongol Empire, founding the Ilkhanate in Persia. Under Hulegu's leadership, the Mongols sacked and destroyed Baghdad, ending the Islamic Golden Age and the Abbasid dynasty. They also weakened Damascus, causing a shift of Islamic influence to the Mamluk Sultanate in Cairo. (Judging by Tomato Soup’s doujinshi Hulegu might have a liking towards pretty faces, idk I just thought it would be funny to put in here)

(OOC: excuse the photo Zeta’s being a bitch and won’t let me upload the original panel) Doquz Khatun was possibly a granddaughter of the Keraite khan Toghrul, through his son Uyku or Abaqu. She was at first given to Genghis Khan and Börte's youngest son Tolui following the demise of her grandfather. After his death in 1232, she was wed to Hulagu, her step-son in levirate marriage. She was known to accompany Hulagu on campaigns. At the Siege of Baghdad (1258), the Mongols massacred tens of thousands of inhabitants, but through the influence of Doquz, the Christians were spared. She died on 16 June 1265, 4 months after her husband.

Sadun Artsruni was a prominent 13th-century Georgian-Armenian noble and military commander who served under the Mongol ruler Hulagu Khan. In 1258, Sadun was chosen to participate in a wrestling (Bokh/Mongolian wrestling) match before Hulagu Khan against a giant, highly skilled wrestler sent by Mongke Khan. After a grueling three-hour match, Sadun emerged victorious, launching his rapid political rise and eventual appointment to high offices within the Ilkhanate.

Mongke Khan was the fourth khagan of the Mongol Empire, ruling from 1 July 1251 to 11 August 1259. He was the first Khagan from the Toluid line, and made significant reforms to improve the administration of the Empire during his reign. Under Mongke, the Mongols conquered Iraq and Syria as well as the Dali Kingdom (modern Yunnan). Mongke’s death in 1259 without a designated successor led to the four-year Toluid Civil War between his two younger brothers, Kublai Khan and Ariq Boke. Though Kublai Khan eventually won, the succession war and the subsequent Kaidu–Kublai war essentially resulted in the permanent division of the Mongol Empire.

Kublai Khan was the founder and first emperor of the Mongol-led Yuan dynasty of China. He proclaimed the dynastic name "Great Yuan" in 1271, and ruled Yuan China until his death in 1294. He had succeeded his older brother Mongke as Khagan in 1260, but had to defeat his younger brother Ariq Boke in the Toluid Civil War lasting until 1264. This episode marked the beginning of the division of the Mongol Empire. Kublai's real power was limited to the Yuan Empire, even though as Khagan he still influenced the Ilkhanate and, to a significantly lesser degree, the Golden Horde.

Ariq Boke was the youngest son of Tolui and a grandson of Genghis Khan. After the death of his brother the Great Khan Mongke, Ariq Boke claimed the title of the Great Khan of the Mongol Empire and briefly took power while his brothers Kublai and Hulagu were absent from the Mongolian Plateau. When Kublai returned for an election in 1260, rival factions could not agree, and elected both claimants, Kublai and Ariq Boke, to the throne, resulting in the Toluid Civil War that fragmented the Mongol Empire. Ariq Boke was supported by the traditionalists of the Mongol Empire, while his brother Kublai was supported by the senior princes of North China and Manchuria.

On Wikipedia, it says that he was a famous 13th-century Persian polymath who was born in Tus, lost his father at a young age and left home to study in Nishapur under Farid al-Din Damad and Muhammad Hasib among others. It's said he was appointed as scientific adviser by Hulegu, after the fall of Alamut castle in 1256.