▁and ▁many ▁cities ▁continued ▁to ▁use ▁local ▁cal end ars ▁on ▁locally ▁mint ed ▁coin age . ▁These ▁included ▁the ▁era ▁of ▁Pom pe y ▁( 6 3 BC ) ▁in ▁some ▁cities ▁of ▁the ▁Dec apolis ▁and ▁the ▁era ▁of ▁Capit ol ias ▁( AD 9 7 / 9 8 ). ▁The ▁B ost ran ▁era ▁may ▁itself ▁be ▁a ▁sp ont aneous ▁local ▁response ▁to ▁the ▁political ▁changes ▁which ▁rendered ▁the ▁old ▁N ab ata e an ▁reg nal ▁year ▁number ing ▁impossible . ▁ ▁The ▁oldest ▁example ▁of ▁the ▁era ▁is ▁found ▁in ▁an ▁N ab ata e an ▁ins cription ▁at ▁Ob oda ▁from ▁AD 1 0 7 . ▁The ▁earliest ▁document ▁is ▁an ▁N ab ata e an ▁pap yrus ▁from ▁Na ḥ al ▁ Ḥ ever ▁( AD 1 2 0 ). ▁The ▁earliest ▁att est ation ▁in ▁Greek ▁is ▁from ▁a ▁pap yrus ▁also ▁from ▁Na ḥ al ▁ Ḥ ever ▁( AD 1 2 5 ). ▁An ▁official ▁ins cription ▁of ▁the ▁Emperor ▁G ord ian ▁III ▁at ▁B ost ra ▁( AD 2 3 8 / 9 ) ▁uses ▁the ▁provincial ▁era . ▁A ▁unique ▁and ▁oft - c ited ▁example ▁of ▁B ost ran ▁d ating ▁comes ▁from ▁a ▁b iling ual ▁ins cription ▁of ▁AD 1 0 8 / 9 ▁at ▁Mad aba . ▁The ▁N ab ata e an ▁d ating ▁clause ▁reads ▁" third ▁year ▁of ▁the ▁e par ch ▁of ▁B ost ra ". ▁There ▁was ▁no ▁such ▁office