Within the early modern Habsburg Monarchy, each entity was governed according to its own particular customs. Until the mid 17th century, not all of the provinces were even necessarily ruled by the same person—junior members of the family often ruled portions of the Hereditary Lands as private apanages. Serious attempts at centralization began under Maria Theresa and especially her son Joseph II in the mid to late 18th century, but many of these were abandoned following large scale resistance to Joseph's more radical reform attempts, although a more cautious policy of centralization continued during the revolutionary period and the Metternichian period that followed.