Most people within the byzantine and Persian empires accept Islam so easily because They would be allowed to serve in government positions and avoid taxes.
The Byzantine Empire was the longest surviving medieval power and its influence continues to this day, influencing religion, art, architecture, and law in many western countries, especially in Eastern and Central Europe and Russia.
Byzantine Empire (or Eastern Roman Empire) was the name of the eastern remnants of the Roman Empire that survived into the Middle Ages. Its capital was Constantinople, now called Istanbul. It also benefited greatly from a stronger administrative center and domestic political stability, as well as enormous wealth, compared to other states in the early Middle Ages.
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