Note 116 — TALE OF GHANIM BIN AYYUB[79], THE DISTRAUGHT, THE THRALL O' LOVE.
Richard Francis Burton translation
Apparently the writer forgets that the Abbaside banners and dress were black, originally a badge of mourning for the Imám Ibrahim bin Mohammed put to death by the Ommiade Caliph Al-Marwán. The modern Egyptian mourning, like the old Persian, is indigo-blue of the darkest; but, as before noted, the custom is by no means universal.