Neháwend, battle of, [75]

Nestorians, [219], [244], [249]

Níshábúr [184], [199], [200]

Nosairians, [89]

Obaidalláh, founder of Fatimid dynasty, [89]

Obay, codex of, [53]

Obolla, [157]

Okba of Yemen, [143]

Omar, Caliph, [74]

Omar II., [82]