Jawhar ibn Abdallah, surnamed
Ja'far al-Siqilli ("the Sicilian"),
al-Rumi ("the
Byzantine"),
al-Saqlabi ("the Slav"),
al-Katib ("the Chancellor") and
al-Qaid ("the General"), (, born early 10th century, died 992), was the most important military leader in
Fatimid history. He led the conquest of
North Africa and then of Egypt, founded the city of
Cairo and the great
al-Azhar Mosque.