<P> Iranian dynastic history was interrupted by the Arab conquest of Persia in 651 AD , establishing the even larger Islamic caliphate , and later by the Mongol invasion . The main religion of ancient Persia was the native Zoroastrianism , but after the seventh century , it was replaced by Islam . </P>
<P> Iranian dynastic history was interrupted by the Arab conquest of Persia in 651 AD , establishing the even larger Islamic caliphate , and later by the Mongol invasion . The main religion of ancient Persia was the native Zoroastrianism , but after the seventh century , it was replaced by Islam . </P>
who conquered the persian empire and most of the ancient world
who conquered the persian empire and most of the ancient world
Islamic caliphate
Islamic caliphate