University Press, 2009), 237–59. On Mongol influence: Donald G. Ostrowski,Muscovy
and the Mongols: Cross-Cultural Influences on the Steppe Frontier, 1304– 1589 (Cambridge:
Cambridge University Press, 1998); Charles J. Halperin,Russia and the Golden Horde:
The Mongol Impact on Medieval Russian History(Bloomington: Indiana University Press,
1985) and hisThe Tatar Yoke: The Image of the Mongols in Medieval Russia, corrected edn.
(Bloomington, Ind.: Slavica, 2009).
On the slave trade, see Christoph Witzenrath, ed.,Eurasian Slavery, Ransom and Abolition
in World History, 1200– 1860 (Farnham: Ashgate, 2015).54 The Russian Empire 1450– 1801