RT Article T1 Ghassān and Byzantium: a new terminus a quo JF Der Islam VO 33 IS 3 SP 232 OP 255 A1 Shahîd, Irfan 1926-2016 LA English PB De Gruyter YR 1958 UL https://ixtheo.de/Record/1523134631 DO 10.1515/islm.1958.33.3.232