Which empire overthrew the Byzantine Empire and effectively changed the region’s religion to Islam?

Ottoman Empire
Sasanian Empire
First Persian Empire
Spanish Empire

What religion influenced the first persian empire as established by cuyrus the great?

Did the spanish settlers and missions have a positive effect on world history? why, what did they do that was positive? why was the treaty of paris (1763) good for the world/world history? did the plymouth colony have a positive effect on world history? why, what did they do that was positive?

How might geography have led to greek -city states choosing different gods or goddesses as the protectors of their cities