▁same ▁calendar ▁that ▁specify ▁the ▁year ▁as ▁being ▁that ▁of ▁El usa . ▁Z b ign iew ▁F i ema ▁suggests ▁that ▁the ▁Cris is ▁of ▁the ▁Third ▁Century , ▁which ▁ultimately ▁resulted ▁in ▁the ▁division ▁of ▁the ▁province ▁of ▁Arab ia , ▁caused ▁loc als ▁to ▁see ▁their ▁calendar ▁with ▁its ▁base ▁date ▁corresponding ▁to ▁ 1 0 6 ▁as ▁distinct ly ▁associated ▁with ▁different ▁major ▁cities . ▁For ▁F i ema , ▁the ▁Emperor ▁Philip ▁the ▁Arab ' s ▁grant ing ▁to ▁B ost ra ▁of ▁metropol is ▁status ▁in ▁ 2 4 4 ▁and ▁the ▁transfer ▁of ▁the ▁administration ▁of ▁Pala est ina ▁T ert ia ▁from ▁Pet ra ▁to ▁El usa ▁after ▁the ▁earth qu ake ▁of ▁ 5 5 1 ▁are ▁the ▁proxim ate ▁causes ▁of ▁the ▁shift ▁in ▁nom en cl ature . ▁ ▁Some ▁documents ▁after ▁AD 1 2 7 ▁are ▁dated ▁by ▁the ▁era ▁of ▁the ▁" new " ▁province ▁( ν ε α ▁ ε π α ρ χ ε ι α ▁A ρ α β ι α , ▁ne a ▁e par che ia ▁Arab ia ), ▁perhaps ▁in ▁conj unction ▁with ▁the ▁first ▁census ▁in ▁the ▁new ▁province , ▁which ▁was ▁taken ▁in ▁that ▁year . ▁ ▁Us age ▁The ▁B ost ran ▁era ▁was ▁used ▁extens ively ▁in ▁" comm emor ative ▁and ▁honor ific ▁ins cri ptions ", ▁but ▁less ▁frequently ▁in ▁" admin istr ative ▁and ▁legal ▁documents ". ▁Its ▁usage ▁was ▁not ▁enfor ced ▁by ▁the ▁Rom ans