The Byzantine Empire was in Eastern Europe and Asia Minor. The Persian Empire stretched from Libya to Central Asia.
Asia Minor.
The Byzantine Empire was destroyed.
The Battle of Manzikert is seen as the beginning of the end of Byzantine control over Asia Minor. After that, the Seljuks continued to expand into Asia Minor.
The Seliuq Turk's invasion on Asia Minor was so harmful because this region was an important source of food and soldiers for the empire.
Europe was always,and until the Byzantine Empire ,Asia minor
Christians from the West and Muslims from the East attacked the empire. Asia Minor was lost to these invaders. This greatly weakened the empire, which had depended on Asia Minor for food and materials as well as soldiers. Before long the Byzantine Empire was reduced to a small area around Constantinople.
No, Constantinople was the capital of the Byzantine Empire. The Byzantine Empire was the Eastern split of the Roman Empire and later ruled from Rome through Southeastern Europe and Asia Minor, down to Egypt and across North Africa.
Empire, southeastern and southern Europe and western Asia.
The Byzantine Empire lies between Europe and Asia. The Eastern portion of the Byzantine Empire has had a number of shrinking borders since the beginning of its time.
I assume the you are asking within the time of the Rightly-Guided Caliphs and the Umayyad Caliphs. Asia Minor at that time was held by the Byzantine Empire which was more capable of defending the Anatolian highlands than was the Arab cavalry at taking it.
Persian Empire