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Initially the Roman emperor Aurelian recognized Vaballathus' rule, perhaps because he was engaged in conflict with the Gallic Empire in the west and hesitated to incite open warfare with the Palmyrene Empire. This mutual recognition is testified by early coins issued by Zenobia under Vaballathus's name, but also acknowledging Aurelian as emperor. In the coins, Aurelian is shown wearing a radiate crown that signifies his supremacy as emperor, and Vaballathus was crowned with a laurel wreath. The Alexandrian minted coins showed Aurelian in his first year and Vaballathus in his fourth year with Vaballathus adopting honorary titles possibly inherited from his father Odaenathus. Although the Palmyrene Empire was centred in Palmyra, Vaballathus and Zenobia probably spent most of their reign in Antioch, Syria's administrative capital. The relationship between the Roman Empire and the newly established Palmyrene empire deteriorated, and a series of Palmyrene conquests, done under the protective show of subordination to Rome, began around 270.