After the Gothic conquest of Italy at the end of the fifth century, modern Lazio became part of the Ostrogothic Kingdom, but after the Gothic War between 535 and 554 and conquest by the Byzantine Empire, the region became the property of the Eastern Emperor as the Duchy of Rome. However, the long wars against the Longobards weakened the region. With the Donation of Sutri in 728, the Pope acquired the first territory in the region beyond the Duchy of Rome.