Prester John
Sorghaghtani was the niece of the powerful Keraite leader of the Mongols, Ong Khan (often known simply as Toghrul). To Europeans, Toghrul was one of the distant Eastern rulers who was sometimes associated with the legend of "Prester John". During Mongol-European diplomacy, the Mongols sometimes played upon this perception by the Europeans, describing Mongol princesses such as Sorghaghtani and Doquz Khatun as being "daughters of Prester John".