A large literature in comparative politics revolves around autocratic stability in general and
irregular leader removal in particular. In this paper, we show that in medieval and early modern
Europe, family was a key asset for monarchs. Sons and daughters as well as brothers and sisters
offered a way of bolstering the position of the lineage, thereby shielding monarchs from
challenges from their elite groups or from foreign powers. This is demonstrated in a statistical
analysis of 27 major European monarchies spanning the time period 1000-1799, which enlists
new, unique data on royal offspring and siblings. The analysis shows that the number of family
relations mattered until the advent of the military revolution and modern states seemingly
undercut the importance of offspring and siblings in the 16th and 17th centuries. These findings
not only elucidate power dynamics in the medieval and early modern world of dynastic politics,
they also have implications for present-day patterns of autocratic stability in countries where
impersonal modern states have not made headway and kinship ties therefore retain their
historical functions and importance.
