Nawruz Beg succeeded to the throne after the murder of his predecessor Qulpa and the latter's two sons, in February 1360.

[3] A contemporary Venetian notary act claims that Nawruz Beg pretended to be a son of Öz Beg without any justification: "quam dici fuisse filium Usbech sine aliqua meritone.

According to some scholars, the apparently identical roles attributed in the sources to Nawruz Beg and a certain Bazarchi (Bazarčī), a descendant of Jochi's son Tangqut (both consorts of Taydula Khatun, both eliminated by Khiḍr Khan), imply that Nawruz Beg and Bazarchi were in fact the same individual.

Nawruz Beg awarded the diploma of investiture (yarliq) to Prince Andrey Konstantinovich of Nizhny Novgorod, who ceded it to his brother Dmitry of Suzdal.

[8] Nawruz Beg's reign was part of the beginning of the anarchy in which over 25 khans followed each other in rapid succession on the throne of the Golden Horde in 20 years, many of them concurrent, and wielding little effective authority.