The only surviving casualty figures come from Cassius Dio, writing roughly a century after the events, and modern scholarship treats his numbers as rhetorical inflation rather than a demographic count; no archaeological or documentary reconstruction has produced an independent total for the revolt across its several fronts.
What would resolve this Archaeological and papyrological evidence of settlement destruction and population loss in Cyrenaica, Egypt and Cyprus specifically datable to 115 to 117 CE, of the kind that could ground an independent estimate against Cassius Dio's figures.
OpenRoman imperial history; classical archaeology of Cyrenaica and CyprusWilliam Horbury, Jewish War under Trajan and Hadrian