Historical Meaning (OED)
Privilege comes from Latin privilegium, originally meaning a law or legal provision applying to a specific person or group.
From the Middle Ages onward, it meant a special right, immunity, exemption, or advantage formally granted by authority to kings, nobles, clergy, or chartered bodies. It was specific and identifiable: who held it, what right they possessed, and who granted it. It was not synonymous with general success or simply living a good life.