Rast was a member of Eastern party and supporter of Khan Safa Giray. He was assassinated during the Moscow supported coup d'etat in May, 1531 when pro-Muscovy Shahghali was planned to be enthroned in Kazan[5]
^Сафаргалиев М.Г. Присоединение мордвы к русскому централизованному государству // Труды Мордовского научно-исследовательского института языка, литературы, истории, экономики . Сер.: Историческая. Issue XXVII - Saransk, 1964. P. 13
^Belyakov A.V. Invisible men in Russian Army in 16th century. Russian Army during the reign of Ivan the Terrible. Materials of academic discussion dedicated to 455th anniversary of beginning of the Livonian War. Part I. Issue II, Saint-Petersburg, 2013 (in Russian)
^Khudyakov M.G. Ocherki po istorii Kazanskogo khanstva [Essays on history of the Kazan Khanate], Kazan, 1923