In this article, Sergei Bogatyrev offers new insight into the problem of continuity and change during the reign of Ivan IV the Terrible by focusing on the micro-periodization of dynastic history. In modern cultural and historical studies, periodization often includes micro-periods that are based on the perceptions of contemporaries. A micro-period can open a longer historical period, mark dramatic events, or reflect day-to-day activities. Bogatyrev argues that the 1550s was an important micro-period in the dynastic history of Ivan IV's Muscovy. The dynasty was in the center of many political and cultural projects of the 1550s, including the relations between the tsar and his cousin Vladimir of Staritsa, redefining the mechanism of succession, and formulating a dynastic vision of Muscovy's past. The micro-periodization of dynastic history reveals important developments that may be easily obscured by the traditional division of Ivan's reign into good and bad halves.