I want to know the answer to the following question:
Before the Muslim invasions, what did previous invaders do in the local cultures?
All the background I'm provided with is that "What does however, make the Muslim intrusions and later Muslim invasions different is that unlike the preceding invaders who assimilated into the prevalent social system, the successful Muslim conquerors retained their Islamic identity and created new legal and administrative systems that challenged and usually in many cases superseded the existing systems of social conduct and ethics, even influencing the non-Muslim rivals and common masses to a large extent, though non-Muslim population was left to their own laws and customs.". Is that enough to answer the question?
Answer: yes