The early military history of Armenia is defined by the situation of the Armenian Highland between the Hellenistic states, and later the Byzantine Empire, in the west and the Persian Empire to the east. The Kingdom of Armenia had a series of repeated struggles for independence from Persia or Rome, followed by renewed conquests into either of the neighboring empires. The period after the Muslim conquests in the 7th century, up to the late 15th century, was mostly marked by domination by other empires, such as by the successive Arab Caliphates, the Seljuk Empire, the Ilkhanate, the Timurid Empire and the Ak Koyunlu and Kara Koyunlu, amongst others. Some periods of greater military independence were, intermittently, achieved under the Bagratids and, albeit located outside the Armenian Highlan