Ibn al-Bawwab, Abu´l-Hasan Ali b. Hilal, known also under the name of Ibn al-Sitri, famous calligrapher of the Buwayhid period who died in Baghdad in 413/1022 (this date is more probable than 423/1031). He frequented the governmental circles of the period, as he was closely attached to the vizier Fakhr al Mulk Abu Ghalib Muhammad b. Khalaf at Baghdad and was for some time in charge of the library of Buwayhid Baha´ al-Dawla at Shiraz.He was also an illuminator (at least one outstanding example of his work surviving), a devout man who knew the Kur´an...