The Iberian nobles acquiesced to this change without resistance,[8] while the heirs of the royal house withdrew to their highland fortresses – the main Chosroid line in Kakheti, and the younger Guaramid branch in Klarjeti and Javakheti. However, the direct Persian control brought about heavy taxation and an energetic promotion of Zoroastrianism in a largely Christian country. Therefore, when the Eastern Roman emperor Maurice embarked upon a military campaign against Persia in 582, the Iberian nobles requested that he helped restore the monarchy.