Roman social patterns and life must be seen against the mosaic of the empire. Economic distinctions modify the pattern imposed by constitutional function or legal status. The most striking fact about society is the gap between rich and poor. The two themes of Romans who reflected on the twenty years after the murder of Caesar were social disruption and moral decay. Contemporary analysis of social problems focused on morality. Imperial liberti provide a striking illustration of the difference the Principate made to Roman society. The Principate brought improved roads, made safer from brigands, sea-lanes at risk from weather rather than pirates. Society changed between 44 BC and AD 69. Some developments, such as the improved right of succession given to women, seem to have happened because views of the family continued to move further away from patriarchy and emphasis on agnatic relationships. The social structure of the ruling elite survived the Julio-Claudian period, but its membership and tone were transformed.