 There is no contemporary Byzantine account of the events, and much of the details come from later Muslim sources.Noting this, as well as the fact that the armies never met, some Western scholars have questioned the authenticity of the details surrounding the event; though in the Arab world it is widely held as historical.The Ghassanids were a group of South Arabian Christian tribes that emigrated in the early 3rd century from Yemen to the Hauran in southern Syria, Jordan and the Holy Land where some intermarried[dubious – discuss] with Hellenized Roman settlers and Greek-speaking Early Christian communities.