With the support of his mother Taydula Khatun, Jani Beg made himself khan after eliminating his older brother and rival Tini Beg at Saray-Jük in 1342; he had already killed another ambitious brother, Khiḍr Beg. He is known to have actively interfered in the affairs of Rus principalities and of Lithuania. The Grand Princes of Moscow, Simeon Gordiy and Ivan II, were under constant political and military pressure from Jani Beg. The reign of Jani Beg was marked by the first signs of the feudal strife which would eventually contribute to the demise of the Golden Horde.