Bahra'
... that under the Byzantine Empire, the Arab Christian tribe of Bahra' were tasked with guarding the Syrian holy city of Rusafa?
... that under the Byzantine Empire, the <a href="./Arab_Christians" id="mwAxw" rel="mw:WikiLink" title="Arab Christians">Arab Christian</a> tribe of <b id="mwAx0"><a href="./Bahra'" id="mwAx4" rel="mw:WikiLink" title="Bahra'">Bahra'</a></b> were tasked with guarding the Syrian holy city of <a href="./Resafa" id="mwAx8" rel="mw:WikiLink" title="Resafa">Rusafa</a>?