There is no recorded unrest against the queen accompanying her ascendance in ancient sources hostile to her, indicating no serious opposition to the new regime. The most obvious candidates for opposition were the Roman provincial governors, but the sources do not say that Zenobia marched on any of them or that they tried to remove her from the throne. According to Hartmann, the governors and military leaders of the eastern provinces apparently acknowledged and supported Vaballathus as the successor of Odaenathus. During Zenobia's early regency, she focused on safeguarding the borders with Persia and pacifying the Tanukhids in Hauran. To protect the Persian borders, the queen fortified many settlements on the Euphrates (including the citadels of Halabiye—later called Zenobia—and Zalabiye). Circumstantial evidence exists for confrontations with the Sassanid Persians; probably in 269, Vaballathus assumed the victory title of "Persicus Maximus" (the great victor in Persia); this may be connected to an unrecorded battle against a Persian army trying to control northern Mesopotamia.