This is a new history of the region known as Kyivan Rus', a state in eastern and northern Europe from the late ninth to the mid-sixteenth century that encompassed a variety of polities and peoples, including Lithuanian, Polish, Ottoman and others. This account for the first time focuses on the history of the region via families, which allows the discussion of a wider region and a larger group of people than has been possible before. The book examines the development of Rus, Lithuania, Muscovy and Tver, and their relations and interconnections with the Mongols, Byzantines and many other peoples. This readable yet thoroughly scholarly book will appeal to anyone with an interest in the history of eastern Europe, a region that is crucial in world politics today.